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I've worked at a lumberyard for 19 years and our claim to fame is quality and service. Most of the custom home builders around here use 5 (sometimes we have 7) ply doug fir plywood. We had Advantek a few years ago but not too many takers. That stuff is hard as a rock and very heavy. Try to sink a nail head below the surface. OSB sells big because it's cheaper than plywood. Look at the deck of a house under construction that's been open to the rain and weather. I'm very new to this forum and Airstreams, so maybe I'm off base here, but I would use a good quality (like Roseburg) 5 ply doug fir plywood.
It's also my understanding that the floors were originally 5/8ths (19/32nds) plywood, not 3/4ths (23/32nds). I know others have used 3/4, but don't know if the 1/8 inch makes a difference. Tom
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