from what ive heard airbags dont work well with decks because side to side they displace air. they work well with heavy trailers etc.
heres what i use
Vehicle Suspension Kits - Timbren Suspension Enhancement Systems
replaces the factory cushion.
ive installed these kits on about 10 1500 trucks with stf decks
they handle like a ferarri with 2 big quads on the deck after
hahahahahaah
but honestly it stops side to side sway and stops bounce in the rollers