[Zekester]

4th pic, boxing in tailgate with 1 x 1 to match the other two pieces of 1 x 1 already on it...5th pic the detail of the 1 X 1 around the heavy plate in the lower corners of the tailgate,
6th pic, the trailer, 1/2" angle set into the bottom, after we cut back the folded steel at that point, 1/2" angle boxing in the hole...