Good morning,
I have never seen the RV VIN used for anything like that. I don't believe it is used like in the automobile business. To find a value, we just need year, make and model. If its a motorhome, the mileage can also come into play.
As for specs, most of that would be available on the manufacturer website. Even past model year information can be found online.
Let me know if we can help.
Thank you,
Ken