Every conversion starts with the same question, and it is the one people agonize over the longest: which van? The honest answer is that all three major platforms — the Mercedes Sprinter, Ford Transit, and Ram ProMaster — can become an excellent camper. They just get there differently, and the differences matter more for some builds than others.
Mercedes Sprinter
The Sprinter is the platform most people picture when they think "camper van," and it earns the reputation. The 144" and 170" wheelbases give you well-understood build dimensions, aftermarket support is enormous, and the available 4x4 and AWD drivetrains are the strongest of the three for genuinely rough access roads.
- Strengths: resale value, drivetrain options, headroom in the high roof, huge accessory ecosystem.
- Trade-offs: highest purchase price, diesel-only maintenance costs, dealer network thins out in remote areas.
Ford Transit
The Transit has quietly become the value pick for DIY builders. Gas engines keep maintenance simple and cheap anywhere in North America, the high roof is the tallest of the three, and recent AWD models handle forest-service roads better than most people expect.
- Strengths: lowest cost of ownership, tallest interior, easy service anywhere, strong safety tech.
- Trade-offs: wheel wells intrude more into the cargo area, and the curved walls take slightly more planning during cabinetry install.
Ram ProMaster
The ProMaster is the sleeper favorite among layout obsessives. Its front-wheel drive means the load floor is the lowest and the walls are the most vertical of any van sold here — which translates directly into more usable interior width. It is the only platform where a full-width bed fits crosswise for most people.
- Strengths: widest, squarest cargo box; lowest floor height; lowest price of entry.
- Trade-offs: no factory 4x4, lower towing capacity, and the front-wheel drive limits deep off-pavement ambitions.
What matters more than the badge
After hundreds of kit fitments, our take is that three questions predict satisfaction better than brand loyalty does:
- Where will you actually park it at night? If the answer is trailheads and BLM land, drivetrain matters. If it is campgrounds and driveways, it mostly does not.
- Who is going to service it? Buy the van your nearest competent mechanic can work on.
- What does your layout need? A crosswise bed pushes you toward the ProMaster; maximum standing height toward the Transit; resale and 4x4 toward the Sprinter.
The best van is the one that disappears underneath your build — you stop thinking about the chassis the day the interior starts working for you.
The bottom line
Our conversion kits and full conversions are built for all three platforms in both standard and extended wheelbases, so the chassis decision never locks you out of the interior you want. If you are cross-shopping, start from the DIY kit pages or our conversions and work backward from the layout.