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I'm probably too late but I would go with tractor paint from Tractor Supply. Once it cures it is as tough as it gets
No guarantee, but how I'd go about such a tongue box would be to hide the rubber seal inside of a reasonably tight labyrinth seal, and put the hinges at the front rather than the back to further 'hide' the rubber seal from road spray. To promote door rigidity I would make a 1/2" square tube frame for the doors, cross-break the door panels, and use two latches.
Teal is the opening frame, blue is the door, black is seal.
Have you looked into Vapex?