you ever consider like a utility bed/box flat bed design? it wouldn't be cheaper unless you made one.
what i have seen work is spray fluid film in all the metal over laps, there is also a spray wax. it might be a cleaner option.
i know an older fella that bought a 2003 dodge truck new and sprayed oil in all those areas and it is the cleanest dodge i have seen in NE.
in my opinion i think this could work better then paint. it seems moisture always finds its way in the middle of paint and metal. vs when oil is in that area moisture cant be.
I didn’t get much done today while I was servicing my daily. I did bang most of the big dent out of the bed.
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Got at it by pulling the gate hinge plate and going at it with a punch through the hole.
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It’s not great but I’m not ashamed to fill it now.
Time to field strip it and give it a good bath.
Try a C-clamp with some flat metal plates to spread the load. (access through the tail lamp opening). Might be able to clean up some of those creases.