I have a 2011 silverado 1500 short bed. I got a kobalt(maxe by better built) toolbox for it that is a little over 12"wide. I also got their grip rite (also made by better built) no drill mounting kit for it. The problem I'm having is, on the inside of the bed, about the front 10" of the bed is boxed in around the rail, and the mount will not work. Anyone else have this problem and come up with a solution without drilling? Thanks