The Dodge Rampage was designed by Larry Wood. It's based on the Dodge Rampage, a compact, car-based pickup truck (a "coupe utility") produced in the early 1980s.
The casting was first released in 1983. Model 5903 is from the "Real Riders" series of that year.
The casting accurately represents the unique shape of the Rampage. The 1983 Real Riders version came in metalflake blue with yellow and orange graphics on the sides. Its defining feature is the rubber Real Riders tires on 5-spoke chrome wheels.
The Dodge Rampage is similar in concept to the earlier Chevy El Camino or the Ford Ranchero castings, all of which are car-based pickups.
The mainline version released in 1983 was red. It was also released in yellow. The casting was only produced for a few years.