Had a 2002 26' class C on an E450 chassis.
Put on Bilstein shocks and Rear Hellwig stabilizer bars and had immediate improvement in handling
Still had the banging noise and swaying on really rough roads and when turning into a parking lot. Significantly better handling when being passed by a tractor trailer or encountering a cross wind.
Sold that coach and bought a 27' 2015 Class on an E450 chassis with Liquid Springs. The ride difference is incredible. No handling issues. Rarely feel the effects of a cross wind. no banging noise unless I hit an extreme bump. No swaying when turning. I can raise or lower the rear of coach 6 inches which means no tail dragging when entering a gas station and when I park the coach on a slanted surface, front to back, I can usually level it out. The ride is very smooth, almost like a high end car. Had this coach for almost 3 years and have had no maintenance issues with the Liquid Springs. Only downside of them is that they are expensive. They can be retrofitted to an older coach.