Today in WW II: 17 Jul 1936 General Francisco Franco stages a military revolt in Spain precipitating the Spanish Civil War. Nazi Germany supports Franco. More 
17 Jul 1944 Protected by the Royal Canadian Navy, the largest shipping convoy of WW II embarks from Halifax, Nova Scotia.
17 Jul 1944 Disaster at the Port Chicago Naval Magazine, CA, where the munitions ship SS E.A. Bryan, explodes killing 320, injuring almost 400 more, many of them African-American stevedores.
17 Jul 1945 Potsdam Conference with Truman, Stalin, Churchill [17 Jul-2 Aug].
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Semitrailer, Low-Bed, 4 Wheel M172 (15 Ton) and M172A1 (25 Ton) (G797)

US Air Force Airmen assigned to the 110th Civil Engineering Squadron, 110th Fighter Wing, upload a John Deere 444H Wheeled Excavator onto an M172 25-ton, Two-Axle, Low-bed, HET semi-trailer, being towed by an M818 5-ton (6x6) Tractor Truck, at Battle Creek Air National Guard Base, MI, 17 July 2005
US Air Force Airmen assigned to the 110th Civil Engineering Squadron, 110th Fighter Wing, upload a John Deere 444H Wheeled Excavator onto an M172 25-ton, Two-Axle, Low-bed, HET semi-trailer, being towed by an M818 5-ton (6x6) Tractor Truck, at Battle Creek Air National Guard Base, MI, 17 July 2005.

The M172 and M172A1 low-boy trailers are four-wheel, front goosenecked semi-trailers used for general transportation requirements. The two rear axles were equipped with four dual-tired wheels.

The 15-ton M172 low-bed semitrailer is used to transport outsized and heavy equipment over all types of roads, trails, and open cross-country terrain. Semitrailer, Low-Bed, M172A1 25-ton is identical in characteristics to the M172 except in its carrying capacity. The M172A1 can be towed over prepared roads with up to a 50,000-pound load.

Overall dimensions of the M172A1 are:

  • Length: 414 in. (10.52 m)
  • Width: 115 in. (2.92 m)
  • Height: 68 in. (1.72 m)

The M172 trailer is slightly shorter, at 406 inches, while the width is identical. These semitrailers have open wheel wells and a usable bed length of 192 inches. M172A1 has 19 lashing rings (D-rings); 5 on each side, 3 on the rear, and 6 on the gooseneck./p>

A stowage box with a pull handle is located on the top forward portion of the gooseneck. A kingpin extends below a fifth wheel upper plate and fits into the tractor fifth wheel when semitrailer is coupled.

When towed by the Truck, Tractor, M123 the semitrailers are designed to be towed over prepared roads at up to 50 miles per hour (mph) and over unimproved roads and open rolling terrain at up to 30 mph.

The manual covering operations and maintenance for the M172 and M172A1 low bed semirailers is TM 9-2330-211-14 dated October 1969. Based on that TM, the FSN for the M172 trailer is 2330-735-9326 and for the M172A1 is 2330-317-6448. Later versions of the manual are numbered TM 9-2330-211-14&P and use NSN format numbers.

An earlier version of the manual was TM 9-8222, dated November 1954.

Semitrailer, Low-Bed, 4 Wheel M172A1 (25 Ton)
Semitrailer, Low-Bed, 4 Wheel M172A1 (25 Ton).

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