Just be mindful that the book value on that coach is about $12,000 from a dealer with some sort of warranty while an as is sale with no support from a private seller would be $7,000 to $8,000 if it was not a fixer upper. A fixer upper would be worth a bit less.
On those mid 90's coaches you have to be watchful of the coach's "house frames" as being mild steel they were highly prone to rot especially if driven in the North during the winter. From the rear basement compartments one should inspect the rear cross member that goes over the top of the frame rails near the drive wheels and supports the house as its prone to cracking where it passes over the truck chassis, One sign that this is failing is a slight hump/bubble in the floor over the rear axle as you walk past the bathroom area.
Its obvious that the seller lied to you about everything working just on the point of the generator so one would have to ask what else did he lie about? Did you call him about the missing keys and the generator being in pieces and not working as he claimed?
Here is the link to the Operators Manual. That should have been in a binder or black bag inside the coach and included all the manuals for the appliances, etc built into the coach.
https://winnebagoind.com/resources/m...Adventurer.pdf
Note that you may have to download and read the manual using the Adobe Acrobat reader.
Here is the Brochure for the coach:
file:///C:/Users/NeilV/AppData/Local...nturer-bro.pdf
I had a 1995 Vectra 33RQ which although a bit more upscale than the Adventurer is still basically the same so I am well aware of the pain points of that era of coach especially once they get past 20 years old.
On the Chevy likely means a P32 Chassis (Bread Truck) so you would want to be careful to inspect the condition of the front air bags along with the independent front suspension (similar to 1950's and 60's automobiles with the same types of problems too) and be sure to find and check the condition of the electric parking brake system. This is operated by a hydraulic brake cylinder powered by an electric motor hidden underneath the coach near the transmission. It needs to have its fluid checked regularly and the brake fluid needs to be flushed out and replaced on a regular basis too. The way its mounted you have to crawl under the coach, clean the area around it along with the cover pristinely and use a mirror to check the fluid level if it does not have a transparent reservoir. There is no real park setting on the transmission so this hybrid hydraulically/spring operated drum brake mounted on the back of the transmission is all you have on the P30 chassis to keep your motor home from rolling away when you put it into park so its maintenance is really critical. I would recommend purchasing a set of wheel chocks to use anytime you leave a P30 parked where it might roll away if the autopark fails to engage completely. Another big problem is sometimes a failure of this system will cause it to engage while your driving forcing you to pull over. If you suddenly seem to loose power and start slowing down on the highway its a good time to start pulling over before you end up with the driveshaft locked up in the middle lane of an interstate.