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Semi-Trailer, Transporter, M15 (40-tons), M15A1 (45-tons), and M15A2 (50-tons) (G160)

Semi-Trailer, Transporter, M15 with Prime Mover M26
Semi-Trailer, Transporter, M15 with Prime Mover M26.

The Semi-Trailer, Transporter, 40-ton, M15 and its variants were low-bed trailers for transport and retrieval of heavy tanks. They were introduced as trailers for the World War II vintage truck-tractor M-26 Heavy Transporter (known as the "Dragon Wagon"). When used with the M26, the combination is called the M25 Truck-Trailer, with sufficient capacity for the M4 Sherman tank and other heavy payloads. After service in World War II and Korea, the M15-series trailers were used in Vietnam. After the mid-1950s, the M-123 Truck, Tractor, 10-Ton, 6x6 was used as the prime mover. The M15-series semitrailers were replaced by the 60-ton M747 Semi-Trailer.

Find additional photos and hi-res versions of the M-15 Semi-Trailer, Transporter at the Olive-Drab Military Mashup:

M15 Semi-trailer. Used for tank transport and retrieval with M26 Prime Mover, right.
M-26 Heavy Transporter Truck was used during World War II, with the M-15 Trailer, as a retriever for the M-4 Sherman medium tank.  The M26 was standardized in  June 1943.  Photo: circa 1945.
M25 Dragon Wagon tank retrievers (M-26 Heavy Transporter with M15 Trailer) hauling LCM amphibious assault boats for the Rhine River crossing, March 1945.
M-26 Heavy Transporter 6x6 Tractor and M-15 Semi-Trailer carrying an M-4 Sherman tank, 1944.
M-26 Heavy Transporter 6x6 Tractor and M-15 Semi-Trailer carrying an M-4 Sherman tank, 1944.
M-26 Heavy Transporter Truck & M-15 Trailer (Dragon Wagon) with 4th Armored Div. M4A3 Sherman tank retrieved after being disabled in combat, near Bastogne, 6 January 1945. The tractor-trailer combination was originally designated as the M-25 but the nomenclature was changed in late 1944 to separately designate the tractor as the M-26 and the trailer as the M-15.

The payload of the Semi-Trailer, Transporter, M15 was:

  • M-15 Semi-trailer: 80,000 lb. (40-tons) (36,287kg)
  • M-15A1 Semi-trailer: 90,000 lb. (45-tons) (40,823kg)
  • M-15A2 Semi-trailer: 100,000 lb. (50-tons) (45,359kg)

The M-26 Tractor units and the M-15/M-15A1 trailers were manufactured by Pacific Car & Foundry Co. of Renton, WA. The M-15A2 trailers were built by Freuhauf Trailer Co.

The low-bed platform M-15 semi-trailer is supported st the rear by eight operating tires of size 14.00x24 on combat rims. Overall length is 461 7/8 inches (approx 38 1/2 feet). Two large ramps are hinged to the rear of the trailer for field loading, operated by the winch on the tractor. A stowage compartment on top of the gooseneck at the front was available to store auxiliary equipment. The neck had distinctive steps built in to reach the top.

The M15A1 and M15A2 had an increased payload along with minor upgrades including hinged covers over the rear wheels. The M15A2 had more extensive modificaions, being strengthed and widened to match larger and heavier post-war US tanks.

Manuals for the M15 semitrailer include:

  • TM 9-767 Truck-Trailer M25
  • TM 9-1767E Ordnance Maintenance

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