When I used the loc rack, it wasnt mounted to the rail directly. What i did was use 1X2" rectangular metal tube (had it laying around). I used 2 self tapping screws through the top into the rail and then am "L" bracket on the bottom screwed into the bed. One was from the rail to the bed floor and the other was from the rail to the wheelwell (longer jack). I then mounted the loc-rac to these. This gave a stronger mount to the rail and added support on the bottom. It was very sturdy, never damaged the rails at all. Also, it allowed me to lower the jack mounting to where it couldnt be seem from the outside of the bed. I then bolted an eye bolt to the lower portion of the metal tube where the rear support for the jack was so I could hold it down with a bunge cord. That held it in place very firmly. I just wish i had a pick. If you want, I can e-mail you pics of what the mounts looked like, as they are still together, but dont have any pictures of it installed on the truck.