I saw this movie on television a few days ago. I was bored and there wasn't really anything else on. The basic plot revolves around a spontaneous road trip from Minnesota to Tennesse trying to stop a package from being delivered. I searched, and it doesn't have an IMCDb entry yet, but it does have some nice cars.

4* Volkswagen Thing [Typ 181] (main car of the protagonists; used for a long period before it unfortunately tumbles off a cliff)
4* Grumman delivery truck (Grumman was on the grille surround; the truck in which the package is being delivered)
3* Ford F-Series (used after the Thing is lost)
2* Ford Crown Victoria (a police car)
1* Mercury Colony Park station wagon (prominently visible from at least two angles during one sequence)

"Overnight Delivery" on IMDb: http://www.imdb.com/title/tt0117276/