I own a set of both Schwarttzy sliders and OEM rock rails with steps. The OEM units are currently installed on my H3. They will work for all but the most extreme conditions. You just remove a couple of bolts each for the steps. Schwartty's are much heavier in weight, but appear to be able to take anything you can throw at them. I can't tell you for sure, since they have never been mounted on my truck. I ordered the first set he made after his own and after six months of waiting, they don't fit correctly. He offered to make good, but I just cut my losses and figure some day I'll find a way to correct the issues...