For sure motorhomsa have zero aerodynamics. You can feel passing cars and trucks because of the air they are pushing into you. Any little breeze from the side will cause over/understeer and see-sawing of the steering wheel. This has absolutely nothing to do with the suspension but the slab sides of the MH. The best way to minimize handling problems is to weigh your unit when full of carry ons and fuel. Go the website of the tire manufacturer of your tires and find the proper inflation levels. You will be amazed at how much better the handling is with properly inflated tires.