Today in WW II: 17 Sep 1939 Soviet troops invade Poland from the east.  More 
17 Sep 1944 Thousands of Allied planes begin airborne assault on Holland, Operation Market Garden.
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Chart of Military Semitrailers, Stake/Flat Bed

M127A2C Semitrailer, Stake, 12-ton, 4-wheel towed by an M-818 Truck, Tractor, 5 Ton 6x6. Courtesy eBay seller fuzzy_toaster
M127A2C Semitrailer, Stake, 12-ton, 4-wheel towed by an M-818 Truck, Tractor, 5 Ton 6x6. Courtesy eBay seller fuzzy_toaster.

Flat bed semitrailers are used to haul general cargo, with or without stake-supported side panels. The flat surface of the semitrailer, with no side panels, is intended for pallets, strapped loads, or containers. With the addition of stake body side panels, an open box is created that can be used for bulk cargo or loose items. When used for transporting personnel, the stake-side semitrailer is often called a cattle car.

Vehicle Description Photo Link
7-Ton 7-Ton Semitrailer, Panel Cargo 7-Ton Semitrailer, Panel Cargo
M-118 M-118 Semitrailer, Stake, 6-ton, single axle (G-751) M-118 Semitrailer, Stake, 6-ton, single axle (G-751)
M-127 M-127 Semitrailer, 12-ton, 4-wheel (G-750) M-127 Semitrailer, 12-ton, 4-wheel (G-750)
M-345 M-345 Flat Bed Trailer, 10-Ton, 2-Axle, 4-Wheel (G-816)
Manual TM 9-8242
 
M-871 M871, M871A1, M871A2, M871A3, Semitrailer, 22 1/2-ton M871, M871A1, M871A2,  M871A3, Semitrailer, 22 1/2-ton
M-872 M872, M872A1, M872A2, M872A3, M872A4, Semitrailer, 34-ton M872, M872A1, M872A2,  M872A3, Semitrailer, 34-ton