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Not really knowing the area I wouldn't hazard a guess on the trailer flooding. If the rest of the floor is OK the bathroom floor is probably 'normal' damage. Some people maintain, others get to it. Things like trailers that are not used but a few times a year often go to the bottom of the list. It might have leaked for years until the floor began to get weak or it changed hands.
I would personally use aluminum to replace the box, but I work with it alot. It really is about 3 or 4 times as expensive as steel to buy and I would hate to insist that it is the only way to go. The steel box on most trailers is still going strong after all these years. My best advice would be use steel, make sure you have a really clean surface for paint, and check carefully again for leaks as you reassemble. It should last longer than the trailer.
John
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