When properly cared for, and owned outside of the rust belt, these vans will go a million miles. Hell, I've seen a Chevy Express van in the rust belt with over 500k (that's 800k if you're French).

They're so simplistic, and parts are so easy to find, that frame rot is really the only thing that can permanently kill one. It's really a shame that the Express is the last van of this breed that's still hanging around. The stubby nose makes spark plugs a harrowing experience, but everything else is easy. They were built to be used indefinitely.