I have seen that truck several times over the years as I have watched the movie. I think it is just a 2WD Dodge pick-up of the same age as M880s. The AF used hundreds of them around air bases and they were just a civilian pick-up with a military data plate and painted blue. I like the Gama-goat being used as a Russian truck.
I wondered about that too. There was a crew cab 2wd Dually for sale locally a few years ago I wish I'd bought now. It was still Air Force blue and you could almost make out the faded lettering. Unfortunately, I was in a phase of 'if it ain't 4WD, it ain't (you know what)" and passed on it even though it was uber cheap.
The Gama Goat with the red star made me chuckle as well. Almost as much as pausing it on the scene where Russell is reading the TM for the EM50 so I could search the number.
No one has made one yet... but searching the number brings up a site where someone did a page about the EM50.