I have owed 6 vans, 2 Mini and 4 full size conversion 3 Ford E-150s and 1 Chevy 1500? I have to say its all about who owned them, how well they maintained them and or kept them out of the weather. I had a E150 I loved that I put two trans in before I gave up on her, she had like 250k miles. I got another one that sat in a garage for like 4 years and was in perfect shape, but after 3 hours driving the thing would stop, every time I had it looked at it was a different thing they said was wrong. I sold it as is, I couldn't use a van that only drove 3 hour radius. My first E150 I loved it and why I bought two more. The Chevy was just a van I didnt want to see go to the junk yard, I bought it for like $1500, drove it a little but mainly I fixed it up and sold it for $2500. Just look at what type you want, full size, shorty, one with a topper, one with a large topper with a push out front? Then Model, Ram, Ford, Chevy, I liked my E-150s. Then just look at it like a car, how are tires, breaks, miles on it, all the normal stuff. Test drive it, and ask a lot of questions. The number one thing everyone should do when buying anything used, "have a professional look at it for you". Ask to drive to your mechanic to have it looked at, they will tell you if its worth it and what repairs you will most likely have to deal with and when. Thats it, if you only do one thing, take it to have it looked at by your mechanic, that alone will save you many many headaches.