I have the DuraFlaps and am very happy with them! I had them make me a custom set of 4 for my Ram. They recommended at a minimum, 5" between the bottom of the flap and the ground to accommodate for things like curbs. Mine are 25" long and have the stainless steel plates at the bottom that are "bolt-less". Very nice quality and they are thick! As a side note, when installing mine, I made a mistake that resulted in a drilled hole in a wrong location on the flap. All it took was a phone call to DuraFlap and another custom made flap was on it's way. I had to pay for it and rightly so but they got on my replacement right away. I'd highly recommend them!!!