My comment about "under 40' coaches" only applies to Diesel Pushers. These coaches have a set amount of coach length, that can't be changed much. There is the area in front of the front wheels used for the entry door and the same in the rear for the engine, transmission and drive line. A gas coach can have the axles out close to each end of the coach.
One of the best coaches I have had, as to handling in the wind, was a 20' Pace Arrow, which was a real box, but had little overhang on each end.
The coach length to wheel base ratio is not the only factor involved, but can be important. There are many other factors involved, so do the test drive in the wind.
2007 Limited SE 40fdts
Las Vegas, NV