IMO, the best thing is try and part it out or just take it to the dump. You could abandon it down here on the Duwamish for use as a plunkers roost. Most of these things are built as light and cheap as possible. I would take it to a RV shop to get it checked out, they will happily find all sorts of things rotted. If you have dry rot in the floor it was caused by water leaking in around the windows and or the roof which also may have rot in structure (wood). I mistakenly bought a camper that was dry rotted in the roof, repaired it myself, pain in the neck. Had to learn all about how RV's are constructed. Just got it done and the drunk across the street forgot to set the brake on his car which rolled out of his driveway and went under the camper that was up on blocks and then fell on his car. He had no insurance, the cops said it was a civil matter. He finally paid for the repair. The repair was very expensive is what I remember. I picked the cheapest shop. Did a good job. They are now out of business. Sorry, after reading all that I have no good suggestions.
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She sits on the dock a fishin' in the water uh, huh
I don't know her name she's the fisherman's daughter uh, huh
Come on down to my boat baby
Come on down where we can play
Come on down to my boat baby
Come on down we'll sail away.