I don't have an SUV, but I do have a heavy, massive LS400.
When I drive 80+ in it, the wife doesn't seem to mind. When I drive the same speed with her in the boxster, she complains.
It's all about road feel.
The SUV driver's don't feel the road nearly as much as we do in a Porsche. So, they drive faster.
There you have it in a nutshell.
Fix this problem by driving much faster or stay out of the fast lane I guess.
