I have a cross bike which is great for getting around town and I have been wanting to put a rear rack on the back end. I have a seat post one which does fine for my rack trunk, but a no go on the shopping panniers. I think when I bought a rack in the past it came with some clamps, does anyone know if thiis is sturdy enough to load up stuff with? Or some helpful hints or brands that might be good in doing this method? I am not to concerned if it scuffs paint since it's got quite a few already.