Quarter Panel Support Rods
Rather than continue using the nut/bolt arrangement on the factory wheel liners (E9TZ-9928370-B), I found these bed quarter support rods on old GM trucks, and bent them to fit. It took some guesswork (& filing) to get the front bolt location, but they seem to help.
I made similar ones for the rear part of the wheel openings.

The heavy yellow wire is from the aux.batt. binding post to the power inverter.