[Rich69shortfleet]

Yep, as I said, I'll need to make a rubber pad to make up for the difference between the side that sits on the tonneau cover rail and the side that sits on the truck bed rail. If you look at my first two pictures you can see a silver slab of metal in place just so I can get the ends sitting level. I'll need to make a rubber pad that will replace that slab of metal.

The rubber pads will be slightly complex in size and shape because I want it to fit and look good and clean, not half-done. I could also cut a notch in the tonneau cover rails to allow the end posts to sit fully flush on the truck box but I really don't want to cut into those rails that deeply but will remain an option if the rubber pad option doesn't work out.