Timbrens as I see them are nothing more than an upgraded bump stop. Many people will argue this point, but what would you call something that replaces your existing part with a part that is larger and comes into contact with the frame sooner? Some people like them, some hate them. Personally if you need something to bring the truck back level after loading ( Timbrens will not) then air bags are a better choice. If you choose the wrong set of Timbrens then they will hit every time you go over a bump and cause all sorts of uncomfortable ride. Your choice and this is JMHO.