Man are these things strong! The design of these sliders, how they mount not only to the body mounts, but to the pinch seam as well, is ideal. I've had occasion to come down on these hard, too hard, and they held up perfectly. They act as a little step up, too, which is nice for the vertically challenged. The hardest part about the install was the pinch seem bolts. A set of long t-handle allen wrenches makes it easier.