I have a 1998 Fleetwood Bounder with a P30 chassis. When on the interstate, and tractor trailers go by, it feels like it pulls the RV into the truck and with this sway, it almost feels like the RV is ...
You might look at Henderson's Line-Up in Grants Pass, OR for info and then check for suspension shops in your area. The sway bars really cut down on the trucks blowing us off the road.