I think the left leg was only a couple inches off the roof initially. Pulled the left down a little, pulled the right up a little, refit and both were touching. If you really look you can see it at the top, which is the case with most all I have seen mounted on a radius roof. Nobody else has ever noticed. It's rock solid, I have had my 230 pound butt hanging on it along with a couple of bicycles on the ladder mounted rack, doesn't even creak.