Installed their rear air bags in place of my coil springs. Also put in Timber grove auto air leveling system. More than pleased. First off the ride empty is smoooooth. And now when tow or have weight in bed stay level automatically. Only drawback is price which is roughly 1600 when done and that's installing myself which is not hard either. But went this route cause previous ram had air suspension and wanted the ride that had and now have again. I did try Steves coil replacement air bags but they were rougher than my coils for some reason, I might be to picky because his products are excellent. He is great to work with also.