Be aware that on the AD trucks the bed side is right against the frame so even if you put a tub to the inside--the frame is still there in the way. Yes, we have used air ride shocks and they can be mounted in a confined space. They do require an onboard pump, valving, and lines. This is fine if your adjusting the height and rate often but, the springs on coilovers can be replaced with little time or labor, cost about $100 a pair, and are stand alone units.
