I haven't seen the movie either, but I can break out the Barris Book( http://www.amazon.com/Barris-Movie-Cars-David-Fetherston/dp/0760301980/ref=sr_1_1?ie=UTF8&s=books&qid=1214567119&sr=8-1 ). The starring van was built on the chassis of a late-1960's Dodge Sportsman(probably A-108 by it's wheelbase).

As for the other vans;
1)1971-74 Ford Econoline.
2)1971-77 Chevrolet G-Series, possibly Chevy Van.
3)1974-77 Dodge B-Series unknown.
4 and 5)See #1.
6)1975-77 Ford Econoline.
7)1961-67 Ford Econoline.
8)See #2.

The Police Cars are a 1972 Ford Custom or Custom 500, and a 1974 Chevrolet, probably a Bel Air.