Here is a brief article on a high speed tank developed in 1932. The tank is described as being able to drive at 60 MPH with the tracks installed (remove the tracks and it did 110 MPH). 1932 was a few years before Tucker began his combat car, and roughly about the time that Harry Miller was working with Bantam on their early Jeep prototypes. (Perhaps a little bit before.)
Given the speed mentioned, I have to wonder if Tucker didn't see the article (or perhaps see a newsreel) on the tank and have a lightbulb go off in his head.
