There's a green '70 Plymouth Suburban wagon and a '59 Rambler wagon back there, plus an '80s Camaro, a '62 Chevy 2-dr sedan, '52 or '53 Ford Crestliner hardtop, and the car in question is parked next to a '74 Plymouth Fury (Blues Brothers, the Monaco is a twin!), but no green Chevy wagon.
I'm with 51 above, I think it's a Dodge Brothers touring car that's been cut into a truck, or someone has cut the back half off for another car.