Probably doesn't make any difference. If you're more comfortable with plastic, then by all means. But you'll have to use the thin boxes. A standard box won't fit in the shell.
Hi there, I have plastic boxes in my 1965Caravel. If you want to go with plastic they should have them at any decent RV store. I found some at Curtis Trailers here in Portland. I think the galvanised would be easier to work with. The screw holes tend to strip out easy in the plastic boxes.
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