Joe, it all depends on how much you can do yourself, while ENJOYING the challenge, and how much time & money you are willing to put into it. Do you have the blessing/support of a significant other for the projects?
Tires are old enough to NEED replacing, as will be the
axle,
propane tank and
battery. All
windows and vents should be removed to be resealed. Does it have a working
refrigerator, heater, and water heater, and converter? Is the foam in the cushions adequate or is it broken down and needs to be replaced as well as curtains? Many of us enjoy a project, but many just want to go out and enjoy camping. You have to weigh all the pro's & cons to determine what you would enjoy. Good Luck, and don't be shy about asking to tap into others knowledge.
Happy Trails
Dave & Paula