I just bought a '95 Roadtrek 190 Popular from my neighbor. I have taken it on one trip so far. It has the 318 Dodge, 4 speed trans and a B350 Chassis. It has 86K miles on it and I got complete records since new. There was no maintenance skipped on it. I preferred the Dodge because I had poor service from my '79 Chevette under factory warranty. Fords were not used by Roadtrek because their construction did not permit lowering of the center floor. Buy what you want and enjoy. I paid $12700. for mine and am happy with it so far. Both of my MHs are stored inside in a barn so they stay clean and out of the weather.
