I have an anti stab kit for my skid.. it has 2 billet wheels that is rubber coated around them. It is only 2 wheels though.. All the other kits I have seen have 4 wheels.. 2 on the outside of the rails and 2 on the inside (location depending on limiter straps). Mine have the 2 wheels just on the outside of the rails.. Is there any advantage to the 4 wheels over the 2 like I have??