I rcall someone asking about doing that a while back. It may not have been here, as I was also a regular on the Gearz site at the same time, but I don't see why it couldn't be done. Using the front suspension from a 2wd Jeep late '80s/early '90s Jeep Cherokee might be one way to go, as they are a 4 link coil spring suspension. Replace the coils with airbags. Suspension from the 4x4 models and the '94-'02 Ram 4x4 could also work, same design exept with a drive axle instead of a tube axle.