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.....Was your box vinyl wrapped when you got it? If so, did you just leave it or remove the vinyl wrap?
Very cool project, and good luck with the sale.
Wow, somewhat anti-climactic! Bummer that you are selling, why did you decide to do that?
If you have not painted it yet you might consider using some 'bus kote'. It is super stuff from everything I Have read, and it is insulative. Not a lot, but it is good stuff, plus it would give you some continuity before you try to sell the thing.
Anyhow, good luck selling your truck.