Recently purchased an Americ-Camp Summit Ridge with frame built by Lippert. Since I have a short bed 3500, I wanted a Fifth Airborne/ Sidewinder. Lippert told me that any change to the pin box would void the frame warranty. So I went with the SuperGlide at twice the cost of the Fifth Airborne Sidewinder. The SuperGlide is a wonderful piece of equipment, but I would have liked the air shock of the fifth airborne. By the way, when I asked how I could have the Fifth Airborne/Sidewinder and still keep my warranty, Lippert told me if I bring the RV to their factory, they would install it under warranty. BS! The folks who sold me the fifth wheel subsequently told me that Lippert is trying to sell their frames to the RV manufactures with the Fifth Airborne/Sidewinder as an option, i. e. , more $$.