1919 Motor Transport Corps convoy
The 1919 Motor Transport Corps convoy was a long distance convoy (described as a Motor Truck Trip with a "Truck Train") carried out by the U.S. Army Motor Transport Corps that drove over 3,000 mi (4,800 km) on the historic Lincoln Highway from Washington, D.C., to Oakland, California and then was ferried across the San Francisco Bay, ending their journey in San Francisco. Lieutenant Colonel Charles W. McClure and Captain Bernard H. McMahon were the respective expedition and train commanders and civilian Henry C. Ostermann of the Lincoln Highway Association was the pilot (guide).
Source: Wikipedia — 1919 Motor Transport Corps convoy (CC BY-SA 4.0)