Here’s another tip we picked up from JD Fabrication. We mounted the bedsides so the trailing lip at the tailgate sits to the outside face of the stock inner bedside, rather than to the inside face. This leaves a gap at the tailgate joint allowing the tailgate to fit well. Otherwise, you have to sand the fiberglass very thin to fit at the tailgate joint or remove the tailgate. Some minor grinding of the inner bedside sheetmetal helped get a close fit.