The Modular Equipment Transporter was designed due to difficulties had by an American NASA astronaut who was awarded what in 1978?
Modular Equipment Transporter: The Modular Equipment Transporter (MET) was a two-wheeled, hand-pulled vehicle that was used as an equipment hauling device on traverses across the lunar surface. Modular Equipment Transporter:  Designed after Apollo 12 astronauts Pete Conrad and Alan Bean had difficulties lugging their equipment significant distances to and from their Lunar Module, the MET primarily functioned as a portable workbench with a place for hand tools and their carrier, cameras, spare camera magazines, rock sample bags, environmental sample containers, and the portable magnetometer with its sensor and tripod. Pete Conrad:  For this, President Jimmy Carter awarded him the Congressional Space Medal of Honor in 1978.
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