Air bags and Coils?
 

I tried searchiing but:

For the H2's w/ coils is it possible to add air bags as well? I like the air bag suspension for towing but if I can only find an H2 with coils, can I also add air bags? I sort of like the redundancy of bags and coils, I'd hate to be towing with just the air ride and have it start to leak 1000 miles from home.

the coils or air bags sit in the same place, its one or the other as far as factory style set up, dont know if there is some aftermarket way to have both or how that might work