Dunno if I can give you a useful answer or not, but - -
First, we need to clear up the semantics. When you talk about an air bag suspension, I'm assuming that you mean a REAL air suspension and not the funky little bags that are found on many coaches that are primarily there to help you level it up some and maybe handle the weight. A real air suspension is going to replace some or all of the leaf/coil springs on your RV.
I have a fairly small Class C on a Ford E450 chassis. The ride was just awful - - a real bone grinder. I completely removed the rear leaf spring suspension and the Firestone air bags, and replaced it with a Reyco Granning suspension that has its own compressor, ride height adjusters etc. Cost about 3K for the parts and took me a couple of weeks to install it - - a BIG job for an old man. Then I installed new Koni shocks - - which didn't help all that much. Sent the Koni's back and had them revalved - - about 150 bucks each - - still not happy so by that time, the Koni FSD shocks were available and I installed four of them.
The coach now rides quite decently - - It was a lot of work and a lot of money, but I think it was a good investment.
Anyone who wants a complete writeup on my project can get one by emailing me at rhaag11@charter.net - - will try to answer questions too.