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The Autocar Model U8144T, officially "5- to 6-Ton, 4×4, Ponton Tractor Truck", (supply catalog number G511) was the largest, and most heavy-duty, of a family of heavy four-wheel drive trucks developed for, and deployed primarily with, the United States Army in World War II.
The M39 series 5-ton 6×6 truck was a family of heavy tactical trucks built for the United States Armed Forces.The basic cargo version was designed to transport a 5-ton (4,500 kg), 14 ft (4.3 m) long load over all terrain in all weather.
The M1 had a ladder frame with three live beam axles, the front on leaf springs, the rear tandem on leaf springs with locating arms. All models had a 181 in (4.60 m) wheelbase. The M1 weighed 27,330 lb (12,400 kg), the -A1 31,200 lb (14,200 kg). Brakes were full air, the tires were 11.00x20 with dual rear tires.
There is also a 15-ton (30,000 lb (14,000 kg)) low bed trailer, the heaviest possible off-road. A 25-ton (50,000 lb (23,000 kg)) low-bed trailer can be towed on prepared surfaces. [40] [41] Unlike commercial trucks the fifth-wheel can also pivot side to side, making a more flexible connection to the trailer.
The front beam axle was mounted on leaf springs, the rear tandem beam axles were mounted on a leaf sprung "walking beam" type suspension. All models shared a 181 inches (4.60 m) wheelbase (measured from the 1st to the 3rd axles). Full air drum brakes were used. The M123 was able to control the trailer brakes independently of the tractor.
The M815 Bolster logging truck, with the M796 bolster trailer, was used to carry long loads like logs, poles, pipes, and bridge sections. The front of the load was secured to a rotating bolster on the truck and the rear of the load was secured to the trailer. The truck and trailer had a tubular boom ("reach") that connected them under the load.