Which chassis should you buy?
Buy a Sprinter if off-road capability matters above all else; the Coachmen Galleria is the luxury touring coach on that chassis, all hardwood finish and R-15 insulation on the long 170-inch wheelbase, and the Grech Terreno is the luxury flagship, hand-built on the 3500XD with everything standard at a published $290,400, while the Airstream Interstate 24GLX is the luxury tourer on the extended chassis, the longest van in the pool, seating seven and sleeping two. Buy a Transit if you want the most interior height, the most builder options, and a lower base cost. Buy a ProMaster if budget is tight and you'll stay on pavement; the Winnebago Travato is the factory benchmark on that chassis, and the Winnebago Solis is its family-first sibling, built around sleeping four, while Thor's Sequence and its sister line, the Tellaro, are the value plays on the same chassis, the Tellaro carrying the lowest published starting price of the group, and the Coachmen Nova is the cold-climate pick, with the best insulation fitted to any ProMaster. Now for the details.
How do the interior dimensions compare?
This is where the Transit wins decisively. The high-roof Transit delivers 81.5" (6'10") of interior standing height — a full 4 inches taller than the high-roof Sprinter, which comes in at 76.7" (6'4"). Both are livable, but that gap is noticeable when you're standing at the stove or changing clothes. The ProMaster is the widest of the three (approximately 60" between wheel wells vs. 48" for the Sprinter), which makes it excellent for crosswise sleeping arrangements. The manufacturers publish the full specifications: Mercedes-Benz Sprinter, Ford Transit, and Ram ProMaster.
What about drivetrain and off-road capability?
- +Sprinter: Gas or diesel (US market). Current models use an on-demand AWD system; the older factory 4x4 with a two-speed transfer case ended with the previous generation. Best ground clearance stock.
- +Transit: Gas only (US market). AWD option with no low range. Good in slippery conditions, limited on technical terrain.
- +ProMaster: Gas only. Front-wheel drive exclusively — no AWD or 4x4 available, ever.
Which is most reliable, and cheapest to own?
The ProMaster has the simplest mechanicals and lowest service costs. The Transit is a close second — extensive dealer network, cheaper parts, and straightforward maintenance. The Sprinter is the most capable but the most expensive to maintain: diesel service at a Mercedes dealer runs $800–$1,500 for routine work, and major repairs can be significant. That said, well-maintained Sprinters regularly hit 300,000+ miles.
Which chassis has the best builder ecosystem?
More quality custom converters build on the Sprinter than any other platform. If you want a custom build with maximum options and the best resale value, Sprinter is the industry standard. The Transit has a large and growing converter community, particularly at the mid-market price point. ProMaster converters exist but the ecosystem is considerably smaller.
Frequently Asked Questions
Is the Sprinter or Transit more reliable?
Both are reliable platforms with different risk profiles. The Transit's domestic engine and parts supply chain make it easier and cheaper to maintain. The Sprinter's diesel engine is extremely durable but requires Mercedes-specific service. For most buyers, the Transit is the lower-maintenance option.
Which van has the best resale value?
Sprinter-based conversions from reputable builders hold value best, particularly with the AWD or 4x4 option. The Sprinter brand carries a premium in the used market. Storyteller Overland also holds value well due to brand demand. ProMaster builds generally depreciate fastest.
Can I fit a full-size bed in a ProMaster?
Yes — the ProMaster's wide interior (approximately 60" between wheel wells) accommodates a full-size (54") crosswise mattress without a raised platform. This is one of its genuine advantages over the narrower Sprinter.