There is a company called AiRock that makes a real sweet air bag system for off road use. As of now they only make it for the Jeep Rubocon (with either a 4 or 6 inch lift). It is pretty expensive. It automatically lowers to stock ride height at speeds above 20mph. When stopped it has an egress setting that lowers it to about stock height for ease of entry/exit. When of roading it can be lifted front, rear, or both. There is an varticle in the June 2003 issue of Peterson's 4wheel & off-road.