I own a 1996 Grumman-Olsen step van (like a food truck). these are industrial vehicles and the Cummins 6bt engine is commonly called “the one million mile engine” which is why it is popular for UPS and FedEx. if you are looking for an extremely durable “van”, then I don’t think you can do much better than a million miles. you can buy these used for about $10k with 100k miles on them (and another 900k of life). with square walls, all aluminum (no rust) and industrial durability, I sometimes find it hard to follow the logic of buying vehicles for triple the money but only 1/3 or less life-span. anyway, just something to throw into consideration!