The Rum Runner has OSB on the roof, but I'd prefer plywood if you have to walk on it for cleaning it just feels a bit more rigid. Another thing I'd do different is to put 1x4 down the center an then some ply wood strips further out to give the plywood a bit of a crown rather than a flat roof that water seems to pool on.
-blizz
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2001 GMC 6500 Topkick, 22' box, dropped frame, designed to fit into a 9' garage door. 3126 CAT 6spd Man Lo-Pro 19.5's w/ 3.07 rear axle ratio
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