You need to see some that have been on the streets in city areas where the salt is very heavy and things rust quickly. I have a few on the street and few on Craigslst for sale with pix. Some of the older GM cars also had galvenized bodies and were slow to rust, but the eventually they did also. I think the early 90s Park avenues were that way and were body on frame so the frames still rusted.
What was the usage of the van you mention?