Let me I.D. a few unknowns:
1970-72 Chevrolet Monte Carlo
Both Dodge Diplomats.
The infamous Ford Pinto, and this one appears to be from the mid-1970's.
1977-79 C-Series of some kind.
Pick one, you say?
Well, okay. You've already got the Peterbilt 352 in the background, so there's an AMC Pacer on the left, a Jeep Wagoneer in the center, and the bed of that pickup on the right looks like a Ford F-Series from anytime after 1980.