Thank You for the opportunity and the point.
You are most likely correct on your identification of "SAM" but I cannot find any reference so far that refers to the vehicle as a "SAM".
On the other hand, I saw several articles that mentioned that NATO referred to this vehicle as "The Goat", referring to the sound of the motor under load.
Another 30 minutes of searching came up with this............
A cup showing such a Ford identified as a "Ziege", German word for "Goat".
Bill