Supersprings?

There great. I've installed many sets. I even put them on my class C.

I like my air bags, can adjust to different weights
PS have seperate air fillers for the bags. one for left one for right side...
PS 2 I fill the bags till the helper spring lifts of the pack, them let the air out till it just toughes the pack again. that way their both working together ,, air bags and the helper springs.

Take a look at Roadmaster active suspension as well