Two Ford Econoline ambulances in two scenes. One in the daytime early in the movie, and one in the night later on.
http://img688.imageshack.us/g/catchthatkidfordeconoli.jpg/
The 1983-91 Econoline is a Super Van, and the 1997-2003 is a cutaway van. They're both one star, although I suspect that the '97 might've been used to haul Sam Robards' character to the hospital.

The Volvo is next.