American lunar rover. Study 1963. The Northrop Lunar Logistic System RV-1 unmanned lunar rover design of January 1963 had 3 wheels, rigidly mounted, and a range of 80 km.
Status: Study 1963. Gross mass: 540 kg (1,190 lb).
An alternate RV-2 design used 4 wheels, rigidly mounted, but was heavier at 680 kg total mass.
The designs had no enclosure and no extended capability.