That was just the first result I found in a generic search. Turns out it was the Mercedes-Benz T-80.
en.wikipedia.org/wiki/Mercedes-Benz_T80
Quote:
The Mercedes-Benz T80 was a six-wheeled vehicle built by Mercedes-Benz, developed and designed by Ferdinand Porsche. It was intended to break the world land speed record, but never made the attempt, the project having been overtaken by the outbreak of World War II.
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Much like Porche's Rome-Berlin race car and the State of Jefferson from northern California it was not to be.