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Beadrolling aluminum side plates, have not seen it done, why?

It’s a normal procedure on floor panels in steel to stiffen them up. I was planning to do it on my aluminum floor also, but most for making a good drainage for water to the floor drain hole. (With rubber button in it when normal driving)

But will it make a difference in stiffness on sidepanels.
Welding crossbars is a good step, but will beadrolling a X in the panels help for compressive forces? Or is it just tension forces the plates help for?

Bead rolling aluminum side plates, will stiffen the panel and reduce panel vibrations. Probably the reason you do not see it done, is because it would look like industrial equipment. If you want to reduce panel vibration, search adhesives panels that you can stick to the back side of the panel, which can change the natural excitement frequency. They would not add that much wt, relative to the total build.

Bead rolling would stiffen it in the wrong direction for the sides and make the direction that it needs the stiffness worse.