Small closed van-type utility vehicle from the 1950s, van body

Small closed van-type utility vehicle from the 1950s, van body, advanced cabin, straight ahead, military army paint simple lines on the front without a front grille, rear engine, steel wheels without hubcaps in body color, No doors, simplest version without chrome, circular headlights screwed to the front sheet metal, parked on a base, with a hatch in the roof and a machine gun mounted on the roof.