Derek, I talked about this in another post. However, an added point that in addition to my belief that the 1/4" steel box is adequate, just under where my receiver was added, there is a bend, or crease, in the plate that kicks back about 10 degrees across the length of the box. That will add significantly to the overall strength of the box at that point. Having said all that, if I see any signs of distortion, I'll go back to plan A and add gussets.
Larry...
Larry...