The pro4x is not supposed to have step rails in the first place so that it can have that extra clearance. Your dealer put some cheap ones on and charged you $1400 for it. They tried to do it to me. Take it back and have them removed.So reading this thread worries me a bit lol. I just picked up a 2011 pro 4X last night. Would I be better off taking them off when I go off road or leaving them on the truck since they are from the 4x? I don't know if the sliders that come on the 4x are any tougher or will they fail like the ones shown on this thread?