We have just bought a gas class A and I have a couple of questions. First is about the Tow Haul having never used one I was wondering if you use all the time or just if you are in hills or mountains...
Tow Haul just changes the shift pattern of the transmission and is beneficial in any area where the transmission is constantly downshifting. It does not hurt the transmission to leave it in Tow Haul in those areas.
Try putting rubber shelf liners under your cushions and see if that will solve your problem.