@Polfusilier @dubbub @Jean_Philippe_Micheaux @Elliptica @plotinus_enjoyer @BowsacNoodle USSR was producing 100k trucks in 1937 so from 1937 to 1942 it would have produced at least 500k trucks. Out of that 30k trucks supplied by America in up to 1942 is practically nothing.
Edit: I was wrong about USSR truck production increasing post 1937, but as we can see from this graph it's still producing >100k "motor vehicles" per year from 1937-1942, our of which the majority can be assumed to be trucks.