Our first Roadtrek 190V was always serviced by our local Dodge dealer, with no problems of doors, lift capacity or height. The problem was diagnosing and fixing troubles. When we were on the other side of the continent (east) the Dodge dealer there had just one hoist large enough with the clearance needed.
Our present Roadtrek 190V Chev gets serviced by Budget Brakes & Muffler (a franchised chain in Canada) and the local Budget place can take a 33 foot long Class A. I questioned him on servicing Sprinter vans and his reply was just another import that had to be learned, though he felt getting parts was more difficult than it should be. Budget has done everything, including installing extra switches, oil changes, leaking seals, rear air shocks, alignment, lube oil & filter, rotate tires, new batteries install, etc., etc.
The Budget franchisee is a real hands on type, and has his 2 i/c run the office. The 2 i/c is no slouch either, he is a transmission expert.
There is no substitute for a good mechanical, electronic technician and they don't seem to be working for the dealers.