ClickyThe Swinger looks clean and in good condition.
Check for any roof leaks, stains etc.. A small leak can ruin the vehicle if not repaired fairly quickly.
A big thing is the tires. Check the age from the date code on the side of the tire.
RV tires usually age out before they wear out. Don't go just by tread depth.
Most RVers replace their tires between 6-10 years.
If you're not familiar with recreational vehicles, consider hiring a mobile RV tech to inspect the unit before you give the seller any money or sign any agreements. It will be a couple hundred dollars well spent.
Make sure everything works before buying any RV.