Heavy Equipment Transport System

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M1070 Heavy Equipment Transporter
M1070 tractor
M1070 Heavy Equipment Transporter.
Place of origin United States of America
Service history
In service 1993-present
Wars Operation Iraqi Freedom, Operation Enduring Freedom, Operation New Dawn
Production history
Designer Oshkosh Corporation
Manufacturer Oshkosh Corporation
Weight 41,000 pounds
Length 30 feet 2 inches
Width 8 feet 6 inches
Height 12 feet 1 inch
Crew 6

Engine Detroit Diesel Series 92 8V92
500 hp
Suspension 8×8
425 miles, 1.7 mpg
Speed 45 mph

The Heavy Equipment Transport System (abbreviated as HET) is a military logistics vehicle transport system consisting of an 8×8 M1070 tractor and M1000 semi-trailer. It is used to transport, deploy, and evacuate tanks, armored personnel carriers, self-propelled artillery, armored bulldozers and other heavy vehicles.

Its primary purpose and use is serving as a tank transporter for the M1 Abrams and recovery of non mission capable armored vehicles.

The Oshkosh-built M1070 replaced the long-lived Oshkosh 6×6 M911 prime mover as the U.S. military's front-line tank transporter tractor unit, and the M1000 the M911's mating M747 semi-trailer.


An M1070 and M1000 loading an M88 Recovery Vehicle in southern Iraq
A Fox NBC-detection vehicle is transported by a HETS trailer

In 1993 the U.S. Army started fielding the 8×8 M1070 Truck Tractor and the M1000 Heavy Equipment Transporter Semi-trailer. The tractor is produced by Oshkosh Corporation, and the trailer is manufactured by DRS Technologies.

HET transports can haul up to 70 tons – primarily Abrams tanks - but is also used for other large military equipment such as forklifts and various tracked vehicles. It is capable of operating on highways (with permits), secondary roads, and cross-country. The M1070 features a number of significant improvements over its precursor M911 which enhance the mobility and overall performance of the system in a tactical environment: among them are front- and rear-axle steering, a Central Tire Inflation System, and cab space for two HET operators and four tank crewmen. The M1000 semi-trailer has automatically steerable axles and a load-leveling hydraulic suspension. It is air-transportable by both C-5 Galaxy and C-17 Globemaster III aircraft.

Over 2,600 M1070s have been supplied to the US Army in various engine configurations, including the 1070E and the 1070E1. The 2013 M1070A1A variant features a 700 horsepower Caterpillar C18 engine which provides 200 more horsepower than the original model. A single-speed transfer case eliminates the need to stop and shift for operation on grades.

The M1070 replaced the Scammell Commander as the British Army heavy tank transporter in 2001. The UK version (1070F) is compliant to European legislation on emissions (EURO III).

General Characteristics[edit]

M1070 tractor M1000 trailer
Length: 30 feet 2 inches (9.19 m) 51 feet 10 inches (15.80 m)
Width: 8 feet 6 inches (2.59 m) 12 feet (3.7 m)
Height: 12 feet 1 inch (3.68 m)
Weight: 41,000 pounds (19,000 kg) 50,000 pounds (23,000 kg)
Speed: 40-45 mph 45 mph
Fuel: 150 Gallons in the driver-side tank, 100 Gallons in the passenger-side tank
Range: 300 miles
Crew: 2+4
Payload: 140,000 pounds (64,000 kg)
Engine: 500 horsepower Detroit Diesel Series 92 8V92 N/A
Transmission: Allison CLT-755 5-speed automatic with TC-496 torque converter
Fording: 28 in
M1070A1 tractor
Axle Configuration: 8×8
Curb Weight: 45,500 lbs. (20638 kg)
Fifth Wheel Vertical Load: 46,000 lbs. (20865 kg)
Maximum Speed: 50 mph (80 km/h)
Air Conditioning: Standard
Engine: Caterpillar® C18, 700 hp 18.1 L
Transmission: Allison® 4800 SP/7-speed automatic
Transfer Case: Oshkosh® 30000 Series/single speed

Previous heavy equipment transports[edit]

M25 Tank Transporter[edit]

M25 Tank Transporter
M26 tractor
Place of origin  United States
Service history
In service 1941-1955
Wars World War II
Production history
Designer Knuckey Truck Company
Manufacturer Pacific Car & Foundry Co.
Weight 22 tons
Length 7.7 m
Width 3.3 m
Height 3.2 m
Crew 7

Armor front 3/4 inch
sides, rear 1/4 inch
.50 cal M2 machine gun
Engine Type 440 6-cylinder gasoline engine
240 hp
Suspension 6×6
400 km
Speed 26 mph (42 km/h)

The M25 Tank Transporter was a heavy tank transporter and tank recovery vehicle used in World War II and beyond by the US Army.

Nicknamed the Dragon Wagon, the M25 was composed of a 6×6 armored tractor (M26) and 40-ton trailer (M15).


In 1942 a new 40 ton semi-trailer tank transporter was required. This was to offer better off-road performance than the M9 24-small-wheel trailer, and greater capacity than the 30 ton 8-large-wheel Shelvoke and Drewry semi-trailers, then in use with the Diamond T tractor unit. This new trailer was designed by the Fruehauf Trailer Company (based in Detroit, MI).[1] A new tractor unit was required, as this heavier trailer was more than the Diamond T could cope with.

The M26 tractor was designed by the San Francisco-based Knuckey Truck Company. When Knuckey's production capacity proved insufficient the Army awarded production to the Pacific Car & Foundry Co. of Seattle, Washington.

Designated TR-1 by Pacific Car, the 12-ton 6×6 M26 tractor was powered by a Type 440 240 bhp 6-cylinder gasoline engine developed exclusively for it by Hall-Scott (although also used to uprate the Diamond T). Some 2,100 Type 440s were built.[clarification needed] Baxter[1] notes "over 1,300" M26 and M26A1 being built.

Unusually, the tractor unit was fitted with both an armored cab and two winches with a combined pull of 60 tons.[1] The intention was that as well as hauling the tank transporter semi-trailer, the tractor unit could itself be used for battlefield light recovery work.

A later unarmored version of the M26 tractor was designated the M26A1. An experimental ballast tractor conversion was experimented with by the British FVPE[1]


The M26 entered service with the US Army in Europe in 1944-45.

U.S. Nomenclature[edit]

In the nomenclature system used by the U.S Army Ordnance Corps Supply Catalog this vehicle is referred as the G160.


  • Crew-7
  • Armament 1-.50 cal. machine gun
  • Armor, front-3/4", sides, rear, 1/4".
  • top speed-26 MPH
  • fuel cap, 120 GAL.

M746/M747 - M911/M747[edit]

M911 tractor and M747 trailer with M60 Patton tank
Oshkosh M911 tractor hauling a load

Prior to 1993, the U.S. Army employed the Commercial Heavy Equipment Transporter (C-HET), which consisted of either the M746 or the M911 truck tractor and the M747 semitrailer.

  • The M746 was an 8×8 22 1/2 ton tractor built by Ward LaFrance from 1975 to 1977. Approximately 125-185 were built.

During Operations Desert Shield and Desert Storm the M911 vehicles were employed primarily to haul M1 Abrams tanks. However, they demonstrated poor durability when loads exceeded 60 tons. Some are still serving as heavy transports of other military equipment, such as cargo handling equipment.

General Characteristics[edit]

M911 tractor M746 tractor M747 trailer
Length: 30 feet 27 feet 48.2 feet
Width: 9.5 feet 10 feet 11.5 feet
Height: 11.8 feet 10 feet 6.8 feet
Weight: 26.3 tons 25.8 tons 17.1 tons
Speed: 43 miles per hour 38 miles per hour N/A
Range: 614 miles 200 miles N/A
Crew: 2 2 N/A
Engine: 430 hp Detroit Diesel Series 92 (8V92TA) 12 cyl Detroit Diesel 12V71T, 600bhp @ 2500 rpm
Transmission: 5-speed automatic N/A


See also[edit]

External links[edit]


  1. ^ a b c d Baxter, Brian S. (1989). Breakdown: A History of Recovery Vehicles in the British Army. HMSO, for REME Museum. p. 51. ISBN 0-11-290456-4. 
  2. ^ "Fort Snelling Military Museum". Archived from the original on 2006-09-21. Retrieved 2006-11-15.