Thanks very much for that great post, Ron. It would have been a great help when we were buying. We were just lucky and got a former rental from a good dealer that seems to be lasting, 8 years so far.
On the length issue, I frequently see comments that a few more feet makes little difference but we were uncomfortable test driving a 26 foot class C and it would have been inconvenient in our driveway. The sheer weight of our 20 footer at 4 tonnes concerns me and I wonder how a 1 ton van chassis has been modified to handle the weight of the house. Ours has the original van power train with two u joints and no hangers but units an extra ten feet or more longer must have a considerably modified drive shaft. When we find ourselves on rough roads I am glad we chose the short one. Do the MH makers upgrade the brakes on an E350 or 450 to handle the overload?