I agree with Leigh Anne that they probably drew it "generic" so as to not look like a particular brand. But it is the design and shape of the pickup trucks of the 70s and 80s. There are many trucks that look much like this if you google 70s pickup trucks or 80s pickup trucks.
Crew cabs were not as popular back then as they are today but they did exist (first made in 1957). In actuality, this looks a lot like the International Travelette, the first to make a crew cab. But still, some artistic license!
Chevy/GMC trucks maintained that vertical front "boxy" look much more and for longer than Ford.
Nothing I saw was a perfect match for the stamp.