S89... Fema trailer , probably OSB on the floor ... just cut away the rotted areas ( I cut it rectangular so it's easier to fit a new piece in ) and replace with new (a good grade of OSB) or plywood ... Careful not to cut through any frame members...
I just had to replace a section of floor in my TT , Replaced the section with plywood , treated with 75% mineral spirits, 25% polyurethane varnish... cheap , and a couple coats , with particular attention to the end grain , makes it much more durable and water resistant ... Usually end up painting that on the surrounding area too so It doesn't rot as quickly ...
Best find how the water got there in the first place , gotta, be a leak ... MUST fix that first ...
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