Built to go further. Designed to live in.

The Summit is a two-berth adventure van built around your kit, your trips, and the way you actually live — not the other way round.

Book your discovery call Summit · MWB MAN TGE Campervan · From £117,500 inc VAT
The Summit

Less van. More adventure.

Everything in the Summit has been chosen because it works, not because it looks good in a spec sheet.

We’ve spent years working out what you really need from an adventure van — and what you don’t. The result is a conversion that’s calm, considered, and completely uncompromising where it matters: the systems, the materials, and the space to actually live in.

Designed and built by hand in our West Sussex workshop

The Onyx Summit adventure campervan on location

Adventures you take for yourself

Out in the wild
“Adventure is an understatement — the Summit goes where other vans (and cars) wouldn’t, which gives you great options.”
— Michael L, Summit owner
At a glance

The Summit at a glance

Two berths. One seriously capable van. Available in FWD and 4×4.

Super king sliding bed

1,900 × 1,670mm — slides away to open up the seating area.

Off-grid as standard

Victron 400Ah lithium, 480W solar and gas-free Aquahot diesel heating — days off-grid, no hookup needed.

Full indoor shower

Pop-up cubicle with composting toilet — folds away completely.

Full kitchen

Double induction hob, 80L fridge, stainless sink.

Rear garage

1,100mm deep, open-through, L-track throughout.

Onyx roof rack

Designed and fabricated in-house, fitted as standard.

Available in 4×4

MAN TGE platform — FWD or 4×4.

Customise your colours

Cabinetry, fabrics, worktop and more — yours to choose, included as standard. Jump to the picker →

Inside the Summit

The interior, feature by feature

Hover any feature to read more. The exterior is further down the page.

Aluminium sliding super-king bed inside the Onyx Summit MAN TGE campervan

The sliding bed

A full 1,900 × 1,670mm super king that slides away in seconds to open up the seating area during the day — no lifting, no rearranging. The aluminium frame makes the van feel far more spacious than its wheelbase suggests.

Rear garage of the Onyx Summit loaded with outdoor kit, L-track fitted

The garage

An 1,100mm-deep rear garage that opens straight through to the front, so there’s no length limit on what you carry. L-track is fitted throughout to secure kit for the drive, with an optional slide-out gear tray if you want it.

Victron touchscreen and 400Ah lithium electrical system in the Onyx Summit

Victron electrical

A full Victron off-grid system — 400Ah of LiFePO4 lithium, 480W of solar, a 50A DC/DC charger, a 3kVA inverter and 120A mains charging. The same equipment used in marine and off-grid home installations, managed from a touchscreen that shows everything in real time.

Aqua-Hot two-zone heating control panel in the Onyx Summit campervan

Aquahot heating

Hydronic diesel heating with two independent zones and on-demand hot water, run entirely from the main fuel tank — so there’s no gas cylinder to manage. It warms the van evenly and quietly without drying the air, and underfloor heating is available as an optional third zone.

Double-induction kitchen and L-shaped sofa inside the Onyx Summit campervan

Kitchen & living

A double induction hob, 80L fridge and stainless sink — a kitchen for people who actually cook. The seating converts from a dinette with removable Lagun table to an L-shaped sofa for the evening.

Indoor pop-up shower cubicle in the Onyx Summit MWB campervan

The shower

A full indoor pop-up shower with composting toilet that folds away completely when you’re not using it, rather than dedicating a permanent corner to a bathroom. There’s an outdoor connection at the rear for kit, wetsuits and dogs.

Spacious open interior of the Onyx Summit medium wheelbase campervan

The space

Most MWB conversions give a big share of the van to a fixed shower room. We don’t — so there’s room to spread out, have friends over, keep a dog comfortable, and store kit without living around it.

Aluminium overhead storage units in the Onyx Summit campervan

Overhead storage

Aluminium rear overheads designed around packing cubes keep everything organised and within reach. The light finish keeps the van feeling open rather than boxed in.

HPL furniture with powder-coated aluminium corners in the Onyx Summit

Furniture & fit-out

Scratch-resistant HPL — the surface used in commercial kitchens — in a choice of colours, finished with powder-coated aluminium corners that protect the edges where lesser builds wear first.

Molle panels fitted to the rear doors of the Onyx Summit campervan

Molle door panels

Molle-panelled rear doors take clip-in pouches and organisers for the kit you reach for most — first aid, head torch, dog leads — keeping it accessible without using up garage or overhead space.

The layout

How the Summit is laid out

A medium wheelbase that lives like something far bigger.

FLOOR PLAN — DAY layout (bed slid away, open seating)
FLOOR PLAN — LOUNGE layout (L-shaped sofa configuration)
FLOOR PLAN — NIGHT layout (super king bed made up)
Onyx Summit MAN TGE 4x4 with roof rack, all-terrain tyres, rear carriers and awning
Outside the Summit

Built for where you’re going

The Summit’s exterior is designed and fabricated in-house — not bought off a shelf. Every component has been chosen to be useful on the road, not just to look the part in a photograph.

An Onyx roof rack, designed and built in-house

Every Summit leaves the workshop with an Onyx aluminium roof rack — designed by us, fabricated by us, and fitted as standard. It’s sized to carry rooftop kit properly, with enough real estate for solar panels, a rooftop tent, or a combination of both. The side ladder gives you safe, clean access.

The rack is one of the details that gives the Summit its distinctive profile. It’s also what makes it immediately clear that this isn’t an off-the-shelf conversion.

Specified for where you actually go

The photos on this page show the Summit fitted with optional upgrades that many buyers add: Black Rhino Warlord alloys with BF Goodrich KO2 all-terrain tyres, Onyx rear carriers with wheel carrier, and a Fiamma F45 awning. None of these are included in the standard price, but all of them are available — and for buyers heading off-road or spending extended time away from facilities, they make a real difference.

If you’re considering a lift kit, all-terrain tyres, or a specific wheel and carrier setup, we’ll talk through what makes sense for your trips on your discovery call.

Walkthrough

Take the tour

A full walk-through of the Summit, inside and out.

WALKTHROUGH VIDEO — YouTube/Vimeo embed goes here
Specification

Every Summit, built to this standard

Ways to customise it are listed further down.

Dimensions

PlatformMAN TGE — FWD or 4×4 chassis 140 / 180 TBC
Overall length6,000mm
Kerb weight3,200kg (inc. driver)
Internal standing heightTBC
Bed dimensions1,900 × 1,670mm (super king)
Garage depth1,100mm
Garage heightTBC — approx. 1,100mm

Sleeping

Berths2
Bed systemAluminium sliding bed — converts to lounge
MattressStandard foam (memory foam and pocket sprung upgrades available)

Electrical

SystemVictron — 12v as standard (24v upgrade available)
Batteries2× 200Ah Victron LiFePO4 (400Ah total)
Solar480W roof-mounted, Victron MPPT controller
InverterVictron 3kVA
Mains charging120A via inverter/charger
DC/DC chargerVictron 50A (upgradable to 100A)
Shore powerHook-up compatible as standard
MonitoringVictron touchscreen
Kitchen chargingUSB A/C + 240v socket
Garage chargingUSB A/C + 240v socket
Bed charging2× USB A (integrated into reading lights)
Van USBFitted as standard

Water & Heating

Heating systemAquahot hydronic diesel
Zones2 — living and sleeping (underfloor available as third zone)
Fuel sourceMain diesel tank — no separate gas cylinder
Hot waterOn demand (no cylinder)
Fresh water109 litres
Grey water87 litres
VentilationMaxxair Maxxfan
Underfloor heatingOptional upgrade

Kitchen

HobDouble induction
Fridge80L compressor fridge
SinkStainless steel with tap
WorktopYes

Living

SeatingDinette or L-shaped sofa (convertible)
TableRemovable Lagun table (stows away)
ShowerIndoor pop-up cubicle with curtain
Outdoor showerRear connection — kit, wetsuits, dogs
ToiletComposting toilet (in shower cubicle)
Overhead storageAluminium rear overheads
FurnitureHPL throughout — choice of colours, powder-coated aluminium corners
Rear door storageMolle panels fitted as standard
Kitchen L-trackFitted as standard

Exterior & Chassis

Roof rackOnyx aluminium — designed and fabricated in-house
Side ladderFitted as standard
Side stepBlack step fitted as standard
Rear stepBlack step fitted as standard
Garage tie-downL-track throughout
WindowsDouble-glazed awning windows with integrated blinds — fitted as standard
A couple relaxing beside the Onyx Summit campervan in woodland
Investment

From £117,500 inc VAT

The Summit starts from £117,500 inc VAT, depending on specification and base vehicle.

That price includes everything in the spec table above — the Victron electrical system, Aquahot heating, full kitchen, sliding bed, garage, and Onyx roof rack. There are no hidden costs and no stripped-back entry spec designed to get you in the door.

We’re happy to talk through what’s included, what’s optional, and what the total cost of your build would look like on a discovery call.

Book your discovery call →
Customise

Customise your build

The Summit is complete as standard. But every buyer is different — these let you tailor it to your trips, all priced transparently. We’ll talk through what makes sense on your discovery call.

Start with

Tick the upgrades below to build your spec — it’s an estimate, not a quote.

Climate

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The Summit is fitted with Aquahot hydronic heating as standard. Underfloor heating adds a second zone. Air conditioning is the option for buyers spending time in warmer climates. Full off-grid air con requires the 24v system upgrade, which is added automatically.

Habitation air con — full off-grid use (requires 24v upgrade)£5,000
Habitation air con — limited off-grid use (12v system)£5,000
Habitation air con — mains hook-up use only£3,500
Underfloor heating — third hydronic zone£3,500

Electrical systems

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Additional 200Ah Victron LiFePO4 smart battery£1,050
DC/DC charger upgrade — 100A (replaces standard 50A, requires upgraded alternator)£1,000
24v system — 5kva inverter and 3×100Ah batteries£2,700
Upgraded USB — Tiger Exped high-powered USB A/C (replacement)£100
Additional Tiger Exped high-powered USB A/C£180
Additional Scanstrut USB A/C port£150
Additional 240v sockets£150
Starlink Roam — fitting only£500

Internal additions

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Widthways bed with side flares£3,500
Internal fresh water tankPOA
Sink chopping board infill£100
Garage gear tray£750
Ridgeline bug screen — side door£380
Ridgeline insulated bug screen and blind — rear£590
Upgraded mattress — memory foam£400
Upgraded mattress — pocket sprung£1,000
Driving seat upholstery£2,000

External upgrades

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Onyx rear carriers and wheel carrier£2,000
Storage boxes for rear carriersPOA
1UP bike carrier — regular duty (up to 30kg)£450 each
1UP bike carrier — heavy duty (up to 40kg)£550 each
Fiamma F45 awning£1,000
Awning LED light strip£300
External spotlightsfrom £250
Black Rhino Warlord alloys with BF Goodrich KO2 tyres (set of 5)£2,400
Seikel 35mm lift kit£3,000
Underbody protectionPOA
ARB air compressorfrom £500

Base vehicle factory upgrades

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Non-standard colour£1,404
Tow bar£472
Headlamp cleaning system£301
Heated and folding electric mirrors£187
Heated windscreen£332
Heated steering wheel£108
Cruise Assist (adaptive cruise control)£1,296
Leatherette seat covering£79
Upgraded alternator (enables future DC/DC charger upgrade)£421
Manual diff lock (AWD only)£796

Kit packages

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Turnkey packages chosen to fit neatly and securely in the Summit’s storage.

Kitchen package — cutlery, crockery, utensils, pots and pans£950
Lifestyle package — chairs, table, firepit, hatchet, packing cubes£1,350

Full contents lists available on request.

0 extras selected £117,500 inc VAT

An indicative estimate based on list options — not a formal quote. The base vehicle, factory choices and any POA items are confirmed on your discovery call.

Take this spec to a discovery call →

Make it yours

Choose your colours and finishes

Every Summit is finished by hand to your taste. Pick the cabinetry, doors, flooring, worktop, wall lining and seating that feel like you – your palette builds as you go, and it’s included as standard.

Included as standard, on every Summit

Your palette

Build your palette freely – we just ask for an email when you download.

Who it’s for

The Summit is built for people who…

  • Wake up at the trailhead instead of driving to it
  • Travel with bikes, boards, cameras, or serious outdoor kit
  • Want to spend a week in the Highlands without thinking about power, water, or heating
  • Don’t want to compromise on space just because it’s a medium wheelbase van
  • Have looked at other converters and found them either overbuilt with things they don’t need, or underbuilt where it actually matters

Whether you’re following the NC500, chasing races across Europe, or just making the most of long weekends — the Summit is the van that keeps up.

FAQ

Questions worth asking

Which Onyx model is right for me?

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The Summit is our medium wheelbase two-berth — the most open and easiest to drive, ideal for couples and solo travellers who want space and simplicity. If you want that same open layout with more room and a full shower room, the Arroyo is the long wheelbase version. If you regularly travel with a family or need to sleep four, the Mesa adds four travelling seats and a permanent shower room, and the Outpost trades the shower room for maximum storage at a lower price. And if you want a more pared-back, flexible van that also works as an everyday load-hauler, the Basecamp is the most accessible model in the range. If you’re unsure, come and see them at the workshop — the differences are clearer in person.

How is the Summit different from the Basecamp?

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Both are medium wheelbase MAN TGE conversions, but they’re built for different priorities. The Summit is open-plan and high-specification — a full kitchen, a super king sliding bed, an indoor pop-up shower, and a large off-grid electrical and heating system for comfortable, extended time away.

The Basecamp is built around flexibility and load space. The layout is modular and pared back, the kitchen is compact, and the systems are sized for shorter trips and outdoor living. It’s the right van if you need it to do more than one job — work van one day, weekend camper the next — and it’s the more accessible of the two on price. If comfortable, extended living is your priority, the Summit is the one; if flexible load space and value matter more, look at the Basecamp.

What are my shower options on the Summit?

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The Summit has a full indoor pop-up shower cubicle with a composting toilet fitted as standard. The curtain and fittings fold away completely when not in use, which is a meaningful part of why the Summit feels so open for a medium wheelbase campervan — there’s no permanent corner dedicated to a bathroom. When you need it, it’s there. When you don’t, it disappears completely.

There’s also an outdoor shower connection at the rear of the van for rinsing kit, wetsuits, and dogs.

If a permanent dedicated shower room is important to you, the Arroyo and the Mesa are both built around one — the Arroyo as the long wheelbase version of the Summit’s open layout, the Mesa as the family van.

What is a composting toilet and does it smell?

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A composting toilet separates liquid and solid waste, which is what prevents odour. Used correctly — and they’re straightforward to use — a composting toilet in a well-ventilated van is genuinely odour-free in normal use. It’s one of those things that sounds more complicated than it is, and most owners stop thinking about it within the first week.

The practical advantages over a cassette toilet are significant: no chemicals, no cassette to empty at a chemical disposal point, and no dependency on campsites. For buyers planning extended off-grid trips in the UK or Europe, that independence matters.

How much off-grid capability does the Summit have — and is it enough?

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The Summit runs a full Victron off-grid electrical system with 400Ah of LiFePO4 lithium battery capacity, 480W of roof-mounted solar, and an Aquahot hydronic diesel heating system that runs entirely from the main fuel tank. In practical terms, that means three to four days of comfortable use without any solar input, and indefinitely with reasonable sun — which in the UK covers most of the year outside of deep winter.

The heating and hot water run from diesel rather than electricity, so they don’t draw on the battery reserves the way an electric heater would. That’s a significant part of why the electrical system goes as far as it does.

For buyers planning extended European travel, full-time use, or running air conditioning, we offer additional battery capacity, a higher-output DC/DC charger, and a full 24v system upgrade. The standard specification handles the vast majority of UK and European adventure use without any additions.

What is LiFePO4 and why does it matter?

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LiFePO4 — lithium iron phosphate — is the battery chemistry used in the Summit’s Victron electrical system. Compared to older lead-acid or AGM batteries, LiFePO4 batteries are significantly lighter, charge faster, last considerably longer, and can be discharged more deeply without damaging the cells. In a campervan context, that means more usable capacity from the same headline figure and a battery bank that will still be performing well a decade from now.

It’s the same chemistry used in high-end marine installations and off-grid home systems — the Summit uses it because it’s simply the best option available, not because it sounds impressive in a specification sheet.

Can I use the Summit in winter?

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Yes — the Summit is built for year-round use in the UK and Europe. The van is fully insulated throughout, and the fresh and grey water tanks are insulated and heated, so cold weather use is genuinely comfortable rather than something you have to manage around.

The Aquahot hydronic diesel heating system runs from the main fuel tank, provides two independently controlled heating zones, and delivers on-demand hot water without a storage cylinder. It heats the van evenly and quietly, without drying the air out, and there’s no gas cylinder to run out of on a cold night in Scotland.

Do I need a special licence to drive the Summit?

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No. The Summit comes in at around 3,200kg kerb weight, which falls comfortably within the 3,500kg gross vehicle weight limit covered by a standard Category B driving licence. Most buyers won’t need to think about this at all.

For buyers who want to carry more — additional water capacity, heavier kit, or specific equipment — a higher payload option is available. If you’re planning to load the van heavily, it’s worth discussing on your discovery call so we can make sure the specification is right from the start.

If you’re planning to drive in Europe, your UK licence is valid across EU member states.

Can I take the Summit on a ferry or through the Channel Tunnel?

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Yes. The Summit’s dimensions are within the standard limits for both ferry crossings and the Channel Tunnel. Height is the most common practical consideration — it’s always worth confirming the specific limits when you book. For buyers planning regular European travel, the MAN TGE platform has a significant practical advantage: MAN’s commercial vehicle dealer network covers the UK and Europe comprehensively, so support is available wherever you are.

How do I fit my bikes in the Summit?

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The rear garage runs 1,100mm deep and opens straight through to the front of the van, so there’s no arbitrary length limit on what you can carry. Most bikes fit comfortably in the garage without modification.

For a cleaner solution, the Onyx rear carriers with 1UP bike mounts — available in regular duty up to 30kg and heavy duty up to 40kg — keep the garage free for other kit and make loading and unloading considerably easier. If you’re travelling with e-bikes, the garage has a dedicated USB A/C and 240v socket for charging overnight.

The right solution depends on what you ride and how many bikes you’re carrying — worth a conversation if your setup is specific.

Where does my dog go in the Summit?

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The garage works well for dogs who prefer their own space on the road — there’s enough room for a dog up to lab or collie size comfortably, and the L-track means you can secure a crate properly for the drive. If the garage is full of kit, the seating area gives a dog of that size plenty of room to settle between the seats. Two spaniels would be easy; two German Shepherds would start to feel tight.

The outdoor shower connection at the rear is genuinely useful after a muddy walk or a beach day — one of those details that sounds minor until the first time you need it.

How much storage is there in the Summit?

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More than most people expect from a medium wheelbase adventure campervan. The rear garage runs 1,100mm deep and open-through, with L-track fitted throughout for securing kit properly on the move. The rear overhead storage units are designed to work with packing cubes and keep everything organised without making the van feel cluttered. The rear doors are fitted with molle panels as standard — a grid webbing system that accepts compatible pouches and organisers, keeping the things you reach for most immediately accessible without using up garage space.

If you want a more structured approach to the garage, a slide-out gear tray is available as an option.

What does the Summit cost?

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The Summit starts from £117,500 inc VAT, and that’s a complete van — the Victron electrical system, Aquahot hydronic heating, full kitchen, sliding bed, rear garage, and Onyx roof rack are all included in that price. There’s no stripped-back entry specification designed to make the opening number look lower than it should.

Many buyers add options before their first trip — rear carriers, an awning, upgraded alloys — and those are listed separately with transparent pricing. The standard Summit doesn’t leave anything meaningful out.

What warranty do I get with the Summit?

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The MAN TGE base vehicle comes with a three-year manufacturer warranty through the MAN dealer network across the UK and Europe. The Onyx conversion — the furniture, electrical systems, heating, and all fabricated components — is covered by a one-year Onyx warranty. Victron components carry their own manufacturer warranty, which is among the best in the industry.

Every completed build also comes with a free three-month check-up, where we go through the van thoroughly and address anything that needs attention after the first few months of use.

Is the Summit road legal?

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Yes. Every Summit goes through an Individual Vehicle Approval process and is registered from new as a motorhome — not a panel van conversion. That means it leaves the workshop correctly classified, with all the legal and insurance implications that come with motorhome registration.

If you’d prefer to register the van as a panel van, that option is available and comes with a small discount on the build price. It’s worth understanding the insurance and usage implications of each before you decide — worth a conversation if you’re unsure which is right for you.

Why the MAN TGE over the VW Crafter or Mercedes Sprinter?

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The MAN TGE isn’t the most familiar choice — most people arrive expecting a Sprinter — but it’s the right platform for what we build, and the reasons are practical.

Against the Sprinter, it’s comparable in quality and capability at a slightly lower base price, which means more of your budget goes into the conversion rather than the base vehicle.

Against the VW Crafter, the more important difference is support. The MAN TGE is the commercial vehicle version of the same platform, which means it’s backed by MAN’s truck dealer network — service centres across the UK and throughout Europe. For a van you’re taking seriously into remote places, that network matters in a way it doesn’t for a van that stays close to home.

We’ve driven other platforms. We kept coming back to this one.

The rest of the range

Is the Summit the right one?

The Summit is our open, compact two-berth. If you want the same open layout with more room and a full shower room, the Arroyo is the long wheelbase version. If you’d rather have a more pared-back van that also hauls a load through the week, the Basecamp is the most flexible way into the range. And if you need to carry or sleep more than two, the Mesa and Outpost are built for families.

Compare all models →

Get in touch

Ready to talk?

A discovery call is a relaxed 30-minute conversation about your adventures, your kit, and whether the Summit is the right van for you. Just an honest chat with the people who’ll build it.

We typically have a 4–6 month lead time, so the sooner you get in touch, the sooner we can get your build in the diary.

Book your discovery call → Or call us on 01403 458 668