I used Aluminum 1" square box tubing bolted to steel brackets welded to the frame. Welded 3/4" OD x 2" long steel box tubing to the bed sides that slides into the 1" aluminum box tubing. 6 places per bed side, 3 at the top and 3 at the bottom. I use 1/4" bolts to hold it all together. Hope this gives you some insight as to how to do it. It is an old junker FORD that I did this to, but the same method will work on your Dodge.
RK
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