Good idea but not thought through well enough
Air bag fits in just right with suspension at rest. Customer drives over a 6 inch curb on daily bases and axle travel extension tore bags off there mounts. Air Lift pro-rated warranty and second set failed also. Modifications to mounts were made and so far so good.
Firestone air ride
The air bags were installed without altering the original suspension there by not effecting the warranty on the vehicle. They also corrected the rear end sag while towing a travel trailer which was the intended purpose. The added on bird compressor with remote control make filling or expelling air simple