To be clear, I doubt the ssp will fail in any significant way, I just think it’s more likely to deform under lighter use. The biggest weakness with either is the material. Aluminum gouges. After waiting for steel units, I bought the Rival stuff, they are sitting at a friends to be coated to match, and I may cut steel plates and fasten them to the underside. The aluminum will act as the supporting structure and the plate will take and distribute the impacts, and provide a “slippery” surface. I typically use .25 steel, but with the Al backing the ply, using .185 may be comparatively superior. I could end up with a better product than straight steel at a weight savings. I had a rough calculation of pert near 400lbs for everything. It was turning out to be sailboat ballast, and that fuel tank needs protecting. (I also am considering getting the 25g aux tank and eliminating the main tank. It sucks where it’s at. I would lose the spot for the rear winch though)
Sometimes you gotta work with what ya got.