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To better maneuver the lunar landscape, NASA commissioned General Motors with the task of designing a series of manned lunar vehicles, and the Mobile Laboratory (MOLAB) was a 1965 prototype. At 20 feet in length and weighing more than four tons, the closed-cabin MOLAB was a beast of the rover. The pressurized vehicle was designed to function as a geological laboratory, capable of sustaining two astronauts for up to two weeks. The rover had a top speed of 21 miles per hour and a range of more than 60 miles.

The unit packed a modified Corvair engine under the hood and was so massive it would’ve taken a Saturn rocket to launch it to the moon. Ultimately, NASA eventually shelved plans for its lunar monster truck and instead went with the slightly slimmer, more practical moon buggy design. Nonetheless, at least a few individuals had the opportunity to test drive the bigger, meaner version in the New Mexico desert before it was decommissioned.