It's not a 31 foot Sovereign
- not enough windows on the port (non-door) side. Maybe it's a 29 or 27 foot model. It does look unloved, and would require a lot of work and money to put it back into usable condition. But, if you're up for doing a complete, major remodel, then go look at her and make an offer. Costs you nothing to go look.
A few things I noticed from the pictures:
The rear hatch is sealed with foam insulation. So is the roof fridge vent.
The rear window is sealed with some black stuff. Probably to try and stop it from leaking.
The door latch has been removed, and it looks like a sliding hardware catch was installed. If you want to replace the latch with an original style, that will cost about $450.
There are a few pretty good dents in the front panels. You may be able to straighten them somewhat, but if you want the dents totally removed, you'll need new panels. This can run $300 to $600 each plus shipping. That's just for the panels. Installation would be more.
There are no good pics of the rear corner panels on the street side. They may be dented as well.
If you do go look at it, walk around the entire floor and feel for spongy spots. The rear section of the floor under the bathroom is almost guaranteed to be rotted and will need to be replaced. Which means gutting the bathroom.
I'm not trying to scare you away, just want to make sure you look at her objectively. We spent 6 years remodeling Little Girl ('72 Sovereign), and a boat load of money. We did all the work ourselves. Took 6 years in part because we both still work full-time, and it's impossible to work on her in a Minnesota winter since she sits outside.