I should also add that when I was in military school I was in the artillery and we hauled 88mm and 105mm canons behind old military Jeep’s, Military Power Wagons and big Deuce and half’s. The Vietnam vet master sgt made us use “driver passenger” lingo to spot off trail as well as maneuvering those trucks in and out of the cramped motor pool. So I think driver passenger lingo has been around for awhile. Maybe just not around you.My dad taught me “driver passenger” lingo back in early 70s. So around 1973-74 we went to upstate NY and futzed around in the woods off the road. He would make me get out and spot for him so he wouldn’t hit big rocks. He liked to drive the car into the woods instead of being in campgrounds. We called it car camping then. we had a red sedan that my dad put bigger snow tires on it. Makes me laugh a little now. We never got stuck though.