SB, the problem with a vehicle that's been sitting a long time is rust, especially with things like brake lines and fuel lines. Friend of mine got hold of a 68 Dodge Dart after it had been sitting for about a year. He brought it into my father's shop to get a couple things done, and the car almost went through the back wall of the shop. All the brake lines burst, rusted through.
And that was in 1986.
Loaded up and pulling a trailer, before you buy a vehicle, find a mechanic to give it a once over, just to make sure.