Pick up a cheap wheel chock from harbor freight.
Replace the rear seat bolts for the driver and passenger brackets with closed eye bolts. The seat bases are heavily tested for crash safety. They'll hold. If the van originally had passenger seats the bolt holes and seat belt bracketed is also...
Chrysler vehicles of that era were notorious for crappy paint. I owned a dozen 90s era dodges. They were all that way. In fact there used to be a recall.
My roadtrek and dodge xplorer class b vans are the same way.
Pro tip. White out happens to match dodge white pretty well....:)