I have the Timbren system on my truck. Easy install, No maintenance, no air lines to worry about leaking. Unloaded, the ride hasn't changed from stock. With the rig in tow, it is considerably smoother ride and no bottoming out on the overload springs. I was considering putting airbags on, but Bob Rohrman gave me his advice on the Timbrens so I went with them. Glad I did.