Hi Joe,
I can share my experience concerning shocks although I have the 8 air bag system. When I bought our coach 10 months ago it had 53000 miles on it. We drove it from Tucson Az to San Francisco and it made my wife and 2 cats sick because of the"porpoising" effect on certain hyways. After doing my homework, I chose the Koni FSD shocks and put them on. I took the same trip this spring and totally different experience. Now when I hit a dip the coach only goes down, up and level. The only thing I don't like is it takes about 5 to 10 miles to "warm" them up from the initial stiffness when you depart.
Regards Fred