Quick update. I took a video of the panel while driving over a rough/bumpy road. As you can see, the panel itself doesn't budge and there's a fair amount of weight on it.
Finally got the storage panels how I like them. Only thing I'm still considering is a good way to store bungee cords. Otherwise, they're pretty well setup. And, yes, that IS a roll of paper towels. It's awesome.
Lovely setup, inspiring. I am sitting here and pondering if I should press the buy button. Did you buy these coated or painted yourself? or are they not painted?