You may want to use a Ford Truck kit, and an excellent choice is the Boonie Boss. The Boonie Boss is the closest model I've found for the Ford trucks in the movie. However, these kits are very hard to come by, going for around $60.00 on Ebay.
The hood of the Wrecker Truck must be modified by removing it and the top sides on either side of the hood; as this is how 1970s Ford F100's hoods opened. The rear is custom made, mostly out of diamond plate. Watch the movie and make sketches to get the shapes right. Add in the towing assembly from the Wrecker Truck. This vehicle has no glass in it; instead use a screen like the wire mesh from a screen window. The front ramming bumper is made from two bumpers combined; the bumper that came with the Wrecker Truck and parts from a semi truck cow catcher from an Italeri Truck Shop Accessories kit.
Front
Right side
Left side
Top rear