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The Mack NM 6-ton 6x6 truck, officially "Prime Mover Cargo truck ", was Mack's first military 6x6. It debuted as a prime mover in 1940, and was used for towing AA guns, and ammunition. Gun crews rode in its canvas covered bed. The NM's enclosed cab came from the commercial L-model. Many NM's were used by the British as recovery vehicles.
A bow and canvas top was fitted, so the truck could be disguised as a common cargo truck. Early trucks had a hard cab and a front-mounted pintle hitch, later trucks had an open cab and a 25,000 lb (11,000 kg) front winch. A 2,000 US gal (7,600 L) gallon trailer could be towed. No follow up orders were made. [6] [19]
The Mack NO 7 + 1 ⁄ 2-ton 6x6 truck was a heavy 6x6 cargo truck designed in the 1940s by the American manufacturer Mack Trucks. It was used by the U.S. Army as an artillery tractor for heavy artillery during and after World War II. The official U.S. Army designation was: Truck, 7 1/2 ton, 6x6, Prime Mover. [2] Its G-number was (G-532).
Mack built 392 M123s, used with a lowboy trailer to recover and transport tanks, and all 552 M125s, between 1955 and 1957. Later follow-up orders called for 420 M123A1s with a Cummins V8-300 785 cu in (12.9 L) naturally aspirated V8 diesel engine developing 300 hp (220 kW) at 3000 rpm and 580 lbf⋅ft (786 N⋅m) torque at 2100 rpm.
Semi-tractor/trailers have to stay on relatively flat ground, and are not rated for full off-road use. On improved roads they could tow up to 55,000 lb (25,000 kg) with 25,000 lb (11,000 kg) on their fifth wheel. [7] [14] Tractor trucks normally towed a 12-ton, 2-axle trailer. There were stake and platform, van, low-bed, and tanker bodies.
The Mack M123 was a 10-ton 6x6 semi-tractor introduced in 1955. The Mack M125 was a heavy cargo truck version of the M123. The M123 was used to tow tank transporter trailers while the M125 towed field artillery pieces.
The July 1943 Ordnance Publications for Supply Index (OPSI); page 68) sums up in detail, the coverage of Group G as: "Armored, half-track, and scout cars; gun, howitzer, and mortar motor carriages; cargo, mortar, personnel, half-track and universal carriers; armored amphibian, light, medium, and heavy tanks; light, medium, heavy, crane and amphibian/track-type tractors; wheeled tractors ...
Mack NM 6-ton 6x6: 1940–1944: 8,400+ Prime mover cargo truck Mack NO 7 + 1 ⁄ 2-ton 6x6: 1943–1945: 2,050: Prime mover cargo truck M1 Wrecker 10-ton 6x6 [11] 1941–1945: 5,765: Standard heavy wrecker during WWII Built by Ward LaFrance and Kenworth. Diamond T 980 12-ton 6x4 [12] 1941–1945: 6,554: Tractor for M19 tank transporter Pacific ...