-Three were built and used on the Apollo program's final, extended "J" missions.
-The three vehicles, officially dubbed LRV-1, LRV-2 and LRV-3 respectively, were used on each.
-LRV-1 bore a plaque commemorating the vehicle as "man's first wheels on the moon", captured in the photography. I've been unable to find if similar plaques were affixed to the other two.
-Each mission had three separate lunar EVAs (not counting other EVAs which occured), for a total of nine sorties of the buggy, each of which involved various bits of stopping and parking.
-The Commander always drove, while the LMP was a passenger who helped with navigation. The LMP could get at the stick if needed (no foot pedals, all literally manual control) but that wasn't how they rolled. As a result, only three men have driven on the Moon: Scott, Young, Cernan. Adding Irwin, Duke and Harrison, six men have "ridden" on the Moon.
-a 1G trainer was used on Earth and I think a fourth production model was sorta-built but the program was concluded around this point and they just sorta-have the parts, or something. So in principle there were five vehicles, or parts leading up to one. I'm unclear on the 1G trainer vs. this phantom "fourth" production model though, more research is needed.
-When Cernan and Schmitt got southwest around the South Massif on their EVA-2, it was the furthest human beings had ever gone away from the safety of a pressurized spacecraft during an EVA of any kind: 4.7 miles, or 7.6 klicks. The record stands.
-The LRV was a meaningful game-changer, developed in about 18 months or so and just-able to fit into an available quadrant on the LM. Otherwise it's just guys putzing around within several hundred feet of the landing site, nothing new to see here.
