I am seeing a lot of comments about the Sumo Springs. I think they are a good product if you need to stiffen the suspension. Look at the problems that are happening on your coach then add upgrades that are made to rectify the problems. Many on this forum have been pleased with Koni shocks when shocks were the problem or for a shock upgrade. If you have a sway problem there are many products to help. Tail wag the dog could indicate Trac bar.
Since you asked about shocke Koni or Bilstein are good places to start.