In the town (wide spot in the road is more like it) of Lukeville is the Gringo Pass Trading Post and RV park. This is the last gas in the US, on the road to Rocky Point. And I had a delivery for them. It's always fun to drive until you see the "International Border 1/2 mile" sign and then keep going until you are staring at the Border Patrol agents and a line of barbed wire. This was across one end of the parking lot at the station! Pumped the gas off into above-ground tanks and headed back toward civilization. Past a USBP checkpoint and on through Ajo and Gila Bend and back to Phoenix. 8 hours round trip.