I've been looking for a 4x4 diesel van or bus for my family to take on a multi-year trip through rural parts of the Americas. My husband is not a mechanic-type, so we will most likely have to take it to a shop if anything breaks down or needs replacing. I found someone near me selling a used 4x4 diesel E-350. They say they think the 80,000 miles are original and correct so it hasn't been driven all that much. But there is rust on it. The seller says he would trust it. I would obviously take it into a mechanic to get a look too, but can I even expect that a van that old could hold up? Or will all sorts of things be going bad just from the age of it?