I had the same sort of box on a class 8 and hung cabinets without a problem. I used 1/2" plywood screwed to the slat board. that stuff is incredibly strong. then just hung the cabinets from the plywood. I think I also had a ledger board the underneath the length of the cabinet.
I think with the plywood, windows can also be mounted. I will be doing this in my new trailer this next week. I did not keep that configuration, so long term effects are really unknown. But I cannot imagine there would have been a problem.
Just remember, those boxes were made with the idea of forklifts crashing into them all day.
I thought I saw your truck on Craigslist? did you decide to keep it?
Mike
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