If you have a full size SUV or pickup, a travel trailer may be a good alternative for significantly less money. As a single person, a 15-18ft trailer should be workable and you don't need a monster 1 ton dually to pull it.
On of the issues with a motorhome is you either need to pull a car behind it or you have to break camp every time you want to run up to the store. With a trailer, you have a built in vehicle to run around with.
If you go this route: Do check the ratings...in particular the payload assuming 15% of the trailer sits on the hitch and counts against the payload (Payload often runs out before you reach the tow rating limit).
As others have said, the biggest likely issue is water damage from leaks. It would be well worth it to pay an RV tech a couple hundred to go over it looking for leaks and making sure everything is functional.