Three were transported to .
Three were left on the moon via the Apollo 15 , 16 , and 17 missions , with the fourth rover used for spare parts on the first three following the cancellation of Apollo 18 .
Three were transported to and left on the moon via the Apollo 15 , 16 , and 17 missions , with the fourth rover used for spare parts on the first three following the cancellation of Apollo 18 .