Pro tip: That oil baron Ethel also spawns near some oil tanks in the desert. The location shows up on the map as four tiny dots (the oil tanks) in a square formation just South of the border between the Northern and Southern Badlands. And unlike at the junk yard, the Ethel's there every time!
Some Are Hidden Like Nahualli's Car By Get Shield And The Hardest One Is The Turreted Lexington Witch I Own All Of The Gang Vehicles Are At Some Location's Across Santo Ileso.