Ya agreed start with the rust. mine had a decent ammount of rust i spent MANY hours on my hands and knees with an angle grider and a welder haha,
-are you going to be replaceing the floors??
-is it a stick shift? mine is, if so make sure you can run through the gears nicely
-Air brakes or hydrulic? I love my air brakes it stops on a dime!
-turbo or non turbo? mine is and you can really feel the power when it spools into action
-1 or 2 piece rims?? i have heard that 2 peice rims can be a pain
-look underneth and check the frame for excessive rust
-Tire condition, i am looking to get some new treads on my bus and they are NOT CHEEP!!!
-And lastly just go with your best knowlege and gut feeling and im sure you will make the rite choice