While mine is a class A, and I bought new, I thought I could use some better sway bars. Turns out the thing I really needed was called a track bar. It keeps the center of the rear axle from being pushed left or right when the leaf springs bend, especially when a truck passes, or a crosswind gust. What I was feeling was the back or front being pushed to, or away from the truck.
I liked the ride when it was right off the lot, but after thousands of miles, I had the desire to try to improve it, just to see if I could. So, the track bar made a big difference, and the sway bars are to combat a rolling motion. Shocks just slow down and dampen the rebound of the springs, and steering stabilizers just force the front axle back to the center somewhat. Many people have done an adjustment to their existing sway bars to make them much less bendable, they call it the cheap handling fix. They mostly like the results, but I'm not sure that it doesn't pass some extra stress to the house built on top in some situations by being stiffer.
For what it's worth, I found that pulling a trailer also made the 'truck passing' push/pull much less, as well, since I experienced that change before I put on the track bar.