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As I recall the only other prototype that was actually built and tested was the wheeled version by Boeing and Goodyear. You are correct, the Boeing/Goodyear version won the trials and went on for further test & evaluation. In house Cat propaganda claimed Cat/MM lost due to the MTS rubber...

I worked at Caterpillar Inc. My department developed Cat's "Mobile Track System" (MTS). MTS is a steel cable reinforced rubber track. It was developed for the "Challenger" series of ag tractors. The advantages of MTS rubber track over Cat's steel track were: (1) ability to road the machine...