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I think you are exactly right. When the coach extends significantly beyond the rear wheels, it creates a large area that will push the rear end around in a sudden gust.
Typical Mercedes Sprinter Class Cs have a wheelbase of 170" and a coach body length of about 300 inches. That is a ratio of 170/300 or .57. Owners complain about sway and spend thousands to try to fix it. Those coaches seem to be in the middle of the sway stability spectrum.
On the better end of the spectrum the Thor Axix/Vegas has a wheelbase of 188" which gives it a ratio of .63 which is better and most owners say it drives nicely. On the worse end of the spectrum is the Winnebago Fuse with a a wheelbase of 156" and a shorter coach length of about 288" which gives it a ratio of .54. I haven't heard any complaints but it is a somewhat new coach.
So yes, consider that ratio carefully when buying an RV.
David
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