M978 tanker

Heavy Expanded Mobility Tactical Truck (HEMTT)
HEMTT M1120A4 in A-kit configuration - without cab armor, the B-kit
Type	8×8 heavy tactical truck
Place of origin	United States
Service history
In service	1982–present
Used by	U.S. Army and others (see Operators)
Production history
Designer	Oshkosh Corporation
Designed	1981
Manufacturer	Oshkosh Corporation
Produced	1982–present
No. built	27,000+ (new build and remanufactured)
Variants	M977A0/A2/A4 cargo truck. M978A0/A3/A4 tanker. M983A0/A2/A4 tractor. M984A0/A1/A2/A4 wrecker. M985A0/A2/A4 cargo truck. M1120A2/A4 Load Handling System (LHS). M1977A0/A2 CBT THAAD Missile Launcher. M1142 Tactical Fire Fighting Truck (TFFT). M1158 water tender. HEMTT A3 (ProPulse).
Specifications (M977A4)
Weight	42,500 lb (19,300 kg) unladen; 69,000 lb (31,000 kg) laden (a-kit); 75,500 lb (34,200 kg) laden (b-kit); 109,000 lb (49,000 kg) (GCWR)
Length	409 in (10.4 m)
Width	96 in (2.4 m)
Height	118 in (3.0 m) (over spare tire)
Crew	2
Armor	a-kit/b-kit; U.S. Army Long Term Armor Strategy (LTAS) compliant
Engine	Caterpillar (CAT) C15, 15.2-liter, 6-cylinder inline water-cooled EPA 2004 compliant diesel 515 hp (384 kW)
Payload capacity	rated at 10 short tons (9,100 kg)
Transmission	Allison 4500SP 5-speed automatic with Oshkosh enhanced 55,000-pound (25,000 kg) 2 speed transfer case
Suspension	Holland ADS-240 air (front); Holland AD-246 air (rear)
Fuel capacity	155 US gal (587 l)
Operational range	300 mi (483 km) loaded
Speed	62 mph (100 km/h)
Steering system	power-assisted on front tandem

The Heavy Expanded Mobility Tactical Truck (HEMTT) is an eight-wheel drive, diesel-powered, 10-short-ton (9,100 kg), tactical truck used by the US military and others. In evolving configurations it has been in continuous production since 1982. The M977 HEMTT entered service with the U.S. Army as a replacement for the M520 Goer.

By early 2015 more than 27,000 HEMTTs in various configurations had been produced by Oshkosh Defense through either new-build or re-manufactured. Current variants have the A4 suffix.

The 10×10 Oshkosh Logistic Vehicle System Replacement (LVSR) is the U.S. Marines’ equivalent of the U.S. Army’s Oshkosh 8×8 HEMTT and Oshkosh 10×10 Palletized Load System (PLS). The Marines do not use the HEMTT or PLS, and the Army does not use the LVSR, but both services use a common trailer (M1076) with all three truck types.

Following the evaluation of proposals submitted by AM General, MAN, Pacific Car & Foundry (PACCAR) and Oshkosh Truck Corporation, In May 1981, the then U.S. Army Tank Automotive Command awarded an initial five-year contract valued at US$251.13 million to Oshkosh Truck Corporation for production of the 10-short-ton (9,100 kg) 8×8 Heavy Expanded Mobility Tactical Truck (HEMTT).

The first prototype HEMTT was completed in December 1981, pre-production examples followed during March 1982, with the first production vehicles produced in September 1982. Over five contract years a total of 2,140 vehicles were to be delivered. Contract options allowed for up to an additional 5,351 HEMTTs to be ordered, bringing production totals to 7,490 vehicles. The bulk of these options were exercised.