I have an airbag setup on mine. It's really more of a custom air suspension and it's manual (meaning I have to run an airline from the compressor to adjust it). Most airbag setups are like helper air springs to aid in hauling. This sounds like what you need (leveling kit + airbags in back) so you can adjust ride height depending on how heavy the tongue weight is, along with other cargo. If you couple that with an adjustable height hitch you'd be set. Mine works great. No matter how much weight I have I can just add air from the on-board compressor/tank and it levels right out. The automatic systems are pretty expensive.
'00 TJ 3 spd, D30 aussie locker/8.8 E-Locker, Currie springs, Savvy/Currie arms