The M31 IS the US version! The US Army realized that they were caught short of vehicles that go go onto a still hot battle area and recover damaged armor. There was a surplus of late production M3 medium tanks so they were used as the basis for a recovery vehicle. Develpoed as Recovery Vehicle T2 it was later standardized as Vehicle,Tank Recovery M31. Some wartime references used the reference"Tare 2" to refer to the armored recovery vehicle. These were later replaced by the M32-series of recovery vehicles, but M31s served to the end of the war in Europe and Italy.
Figarti captured the features of the M31. This vehicle has long been of interest to me so I have examined phoos and models of it for years. The turret had a dummy 37mm gun and the 75mm gun in front was fake also (so the enemy would not see the M31 as a helpless target). The 75mm mount was replaced by a door into the crew compartments (the side doors were welded up - which is reflected on the model). The turret received a lifting boom. The capacity of the boomcould be increased by using folding legs for support - these are present on the Figarti model and on the prototype model they were moveable. There was no mention of figures yet, but the Grant and Lee models each had three figures, so presumablythe M31 would come with some crew as well.
IMPORTANT - Rick Wang said that production of the M31 model is "being considered" so please contact them to show support for a run of these to be made. We only get these unusual models if we vote with our checkbooks!
The M31 was also supplied to the British and Free French forces. To the British the "Grant ARV Mk 1" was a recovery vehicle converted by the British and the "Grant ARV Mk 2" was the M31.
Possibilities - the US Army deployed large 8 inch (203mm) guns and 240mm howitzers as the extra heavy artillery. These were in battalions that were part of the artillery assests of the field armies and were assigned as needed. The desired towing vehicle, the M6 high speed tractor, was not ready in time for these guns so surplus M31s were converted to gun tractors to pull these large weapons.
Another possibility - the British and Americans developed a tank mounted searchlight - the "Canal Defense Light". The aim was to deploy hundreds of CDLs to allow night tank attacks. The program was so top secret that the lights were never used on a large scale, but hundreds of surplus Grant and Lee tanks were converted. This could be an interesting limited edition model.
Gary B.