The Oshkosh Defense HEMTT A4 is the latest version of the Heavy Expanded Mobility Tactical Truck  aka HEMTT, which entered US Army service in 1982. The A4 version can either be a new build vehicle or installed as an upgrade in the HEMTT Recap Process when the vehicle is stripped and rebuilt as a 0-hour condition. The A4 upgrade is across the whole HEMTT variants and then re-designated the HEMTT A4.

The HEMTT A4 offers significant improvements and advancements in power, maintenance, and soldier safety. It has a new moe powerful 500hp Caterpillar C15/17 engine. Major changes and additions to the cab allow for greater soldier comfort and superior safety with the most up-to-date integrated armor and under-cab protection.

The Oshkosh Defense HEMTT A4 Variants

HEMTT A4 M1120A4 Load Handling System (LHS)

Containerized roll-in-roll-out platform (CROP) allows for cargo hauling
500 horsepower Caterpillar® C15 engine offers 55 more horsepower than its predecessor, the HEMTT A2
Allison® 4500 SP/5-speed automatic transmission, rated for 600 horsepower, offers 1,750 lbs.-ft. (2373 N-m) of gross input torque
Electrical system is 24V using a 260A alternator; includes both 24V and 12V auxiliary power outlets

HEMTT A4 M977A4 Cargo Truck

21,561 pound (9780 kg) payload capacity
On-board crane with 4,500 pound (2041 kg) load capacity
Optional 20,000 pound (9072 kg) self-recovery winch
Anti-lock braking system

HEMTT A4 M978A4 Fuel Servicing Truck (Tanker)

Able to transport 2,500 gallons (9464 L) of fuel
Large, climate-controlled, armor-ready cab
Anti-lock braking system
Optional 20,000 pound (9072 kg) self-recovery winch

HEMTT A4 M983A4 Light Equipment Transporter (LET)

Allison® 4500 SP/5-speed automatic transmission, rated for 600 horsepower
Large, climate controlled, armor-ready cab
Anti-lock braking system

HEMTT A4 M983A4 Patriot Tractor

Tows M860 semi-trailer, to which the Patriot missile is mounted
Allison® 4500 SP/5-speed automatic transmission, rated for 600 horsepower
Anti-lock braking system

HEMTT A4 M984A4 Recovery Truck (Wrecker)

Includes a crane and winch retrieval system
Lift-and-tow system allows recovery of disabled vehicles in as little as two to three minutes
Able to recover vehicles weighing in excess of 10 tons (9072 kg)
Large, climate-controlled, armor-ready cab

HEMTT A4 M985A4 Guided Missile Transporter (GMT)

Mounted crane with a lifting capacity of 5,400 pounds (2455 kg)
Removes spent missile canisters from the launcher and replaces them with fresh missiles
Large, climate-controlled, armor-ready cab
Optional 20,000 pound (9072 kg) self-recovery winch

HEMTT A4 M985A4 Cargo / MLRS Resupply

On-board crane with 5,400 pound (2455 kg) load capacity
Optional 20,000 pound (9072 kg) self-recovery winch
Anti-lock braking system