As somebody who is into his second vintage camper rebuild, a couple things I can tell you for sure- water damage is always more extensive than you think, and you don't know the extent until you take the skins off the outside. And second, it's a labor intensive job. If you are paying for a pro to replace the back wall, it's definitely not a $500 repair.
Your 2001 isn't a vintage camper, but its a "stick and tin" construction, just like a lot of 60's and up campers. There is a very active community of diy'ers and pros that do these types of repairs and share their knowledge. There is a forum called Vintage Trailer Talk that would be a good place to start if you want to get a better idea of what might be involved.
As others have suggested, your best bet may be to sell it as-is with an honest disclosure. Very doubtful you would get your money back on the cost of a repair.
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2022 Columbus 379MBC (Previous 2013 Rockwood Roo 23 IKSS)
2023 F-350 (Previous 2017 F250, 2005 F-150)
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