Cool scenario idea!
Not to nitpick, but the proper designation is the M-8 Greyhound Armored Car. This was a 37mm armed (and coax 0.30mg) 6x6 armored car designed by Ford. The chassis was also used for the M-20 armored utility car.
The M3 was an early war open topped scout car armed with machine guns (usually 1x .50 at the front and 1-2x 0.30 mounted on a perimeter rail (aka "the skate rail") and trolley deal.
M-3's do exist in numbers...they were simple, 4 wheel drive, and built well by the White truck company. A number exist in collections. Imagine a US halftrack of WW2 with wheels in the back and you get it.
-Dave
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