Dunno how many rotting plywood trailer boxes I've seen in Florida over many years. Most of em I guess, incuding mine. There is no such thing as a NEW wooden trailer box.

Epiphytic wood-destroying fungi we'll have with us forever, as dead wood has not evolved a defense against it. Never use wood unless well-$epoxied.
Also your stuff will always fall off the flat floor and get caught under the upside-down canoe = bad idea. But look on the bright side---You are now qualified to design a war in Mess-O-Potamia!