The M809 Series 5-ton 6x6 truck (G908) was a family of heavy tactical trucks built for the United States Armed Forces. The basic cargo version was designed to transport a 5-ton (4,500 kg), 14 ft (4.3 m) long load over all terrain in all weather. In on-road service the load weight was doubled. Built by AM General, they evolved into the M939 Series.

AM General is an American heavy vehicle and contract automotive manufacturer based in South Bend, Indiana. It is best known for the civilian Hummer and the military Humvee that are assembled in Mishawaka, Indiana. For a relatively brief period, 1974–1979, the company also manufactured transit buses, making more than 5,400 of them.