Oshkosh Defense to deliver HEMTT trucks M1120A4 - M977A4 - M978A4 and M1070A1 to US Army

According to a contract published by the United States Department of Defense on September 22, 2021, American company Oshkosh Defense LLC, Oshkosh, Wisconsin, was awarded a $16,708,584 firm-fixed-price contract for M1120A4 Heavy Expanded Mobility Tactical Trucks (HEMTTs), M977A4 HEMTTs, M978A4 HEMTTs, and M1070A1 Heavy Equipment Transporters.
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The 105th Quartermaster Water Purification and Distribution Company from the Puerto Rico Army National Guard uses the M105 Compatible Water Tank Rack, also known as the Hippo, mounted to an M1120A4 Load Handling System. (Picture source U.S. DoD)

The Heavy Expanded Mobility Tactical Truck (HEMTT) is an eight-wheel drive, diesel-powered, 10-short-ton (9,100 kg) tactical truck designed and manufactured by the American company Oshkosh Defense.

The HEMTT's objective is to provide heavy transport capabilities for the supply and re-supply of combat vehicles and weapons systems. Compared to earlier-generation 5-ton trucks in U.S. Army service it offers increased payload and mobility. The HEMTT is available in a variety of configurations, including cargo, tanker, tractor, and wrecker.

The HEMTT was developed from the outset as a tactical truck, but to minimize procurement and life cycle costs included militarized commercial automotive components where possible, including the engine and transmission. Some components used in early HEMTTs are common with the Oshkosh Logistics Vehicle System (LVS) vehicles which were supplied to the U.S. Marine Corps.

The HEMTT is produced in different variants including the M977 cargo truck, M978 tanker, M983 tractor unit, M984 wrecker, M985 cargo variant for missile systems, M1120 Load Handling System, M1977 Common Bridge Transporter, M1142 Tactical Fire Fighting Truck, M1158 HEWATT to support M1142, and M1075 used for THAAD missile system.

Original HEMTT models now have the suffix A0. Only the M984 wrecker was produced in A1 configuration. All models were produced in A2 configuration. The A3 suffix is applied to HEMTT technology demonstrators with a diesel-electric drive system. Current HEMTT production models have the suffix A4.