Today in WW II: 18 Apr 1941 As German troops approach Athens, the Greek Prime Minister Alexandros Koryzis commits suicide.  More 
18 Apr 1942 Doolittle Raid takes American bombers to Tokyo.
18 Apr 1943 Japanese Combined Fleet Admiral Isoroku Yamamoto killed when intercepted and shot down over Bougainville by 18 P-38 aircraft, the longest such mission of the war.
18 Apr 1945 Esteemed American war correspondent Ernie Pyle killed by Japanese machine gun fire, island of Ie Shima off Okinawa.
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M-126 Chassis, Semitrailer, 12-ton, 4-Wheel (G750)

M-126 Chassis, Semitrailer, 12-ton, 4-Wheel, From TM 43-0001-31, June 1985
M-126 Chassis, Semitrailer, 12-ton, 4-Wheel, From TM 43-0001-31, June 1985.

The M-126 semitrailer chassis series is the base for three semitrailers:

The M126 Chassis consisted of a pair of frame rails with a ladder of cross members to form the undercarriage. Landing gear along with the upper fifth wheel plate and kingpin are added to the frame. At the rear, two axles mounting four wheels with dual tires (total of eight tires) were fitted under a leaf spring suspension. Wiring, lighting, spare wheel mount, and brakes complete the chassis package.

Additional information is available on the linked pages for the semitrailers derived from the M126 Semitrailer chassis.

Manuals for the M-126 Chassis, Semitrailer will be in the TM 9-2330-207-xx series, where the xx represents the maintenance level. The first parts list is ORD 9 SNL G-750, dated 13 April 1953. The NSNs for the M126 variants are:

Model NSN
M126 2330-???
M126A1 2330-???
M126A1C 2330-???
M126A2C 2330-00-788-6315