T-13 Hornet B

The T-13 Hornet B by New York's Trackless Tank Corporation was developed as a private venture in the late 30s. It was demonstrated to the US Army and also members of the Canadian, British and Australian forces. The Canadian contingent actually ordered a vehicle to test in 1940, but in the end it was rejected by all. 

Weighing 7.5 tons, it featured 1/2" armour and variations of armament were tried.  Power was to be either gas or diesel, the prototype used a 265 horsepower radial diesel engine, the rear six wheels were powered. 

There was further development in 1941 with a welded rather than riveted hull but that also came to nothing. 

Lt Col. Robert J. Icks, Tanks and Armoured Vehicles.  Phillip Andrews Pub. 1945