Bryan,
We used a piece of diamond plate steel for a floor on my 66 Stepside. Don't get to wild with that welder. That single wall bed is going to heat up quick and burn that paint on the outside. I saw a post a while back where someone used T-rex from Lowes for their floor. They said it held up very well and it has like a 100yr warranty. I know something like that would require you to put your metal strips back in the floor. You could still spray the inside of your bed and leave the floor wood/t-rex.
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