Today in WW II: 21 Jul 1944 US forces land on Guam.   

Chart of Military Semitrailers, Low Bed

Soldiers from the Forward Support Company, 54th Engineer Battalion, load equipment and supplies onto an M870 40-ton semitrailer for a logistics convoy while deployed to Iraq, June 2009
Soldiers from the Forward Support Company, 54th Engineer Battalion, load equipment and supplies onto an M870 40-ton semitrailer for a logistics convoy while deployed to Iraq, June 2009.

Vehicle Description Photo Link
M-9 Trailer, Tank, 45 Ton, M9 (G159) with integrated dolly Trailer, Tank, 45 Ton, M9 (G159)
M-15 Semi-Trailer, Transporter, 40 Ton, 8-wheel, M15 and variants (G160) Semi-Trailer, Transporter, 40 Ton, 8-wheel, M15 and variants (G160)
M-172 Semitrailer, Low-Bed, 4 Wheel M172 (15 Ton) & M172A1 (25 Ton) (G797) Semitrailer, Low-Bed, 4 Wheel M172 (15 Ton) & M172A1 (25 Ton)
M-269 M-269 Semitrailer, Low Bed. 12-ton, Wrecker, 4-wheel
Manual TM 9-8240		 M-269 Semitrailer, Low Bed. 12-ton, Wrecker, 4-wheel
M-270 M-270 Semitrailer, Low Bed. 12-ton, Wrecker, 4-wheel
Manual TM 9-8240		 M-270 Semitrailer, Low Bed. 12-ton, Wrecker, 4-wheel
M-747 M747 Semi-Trailer, Low Bed, Heavy Equipment Transporter, 60 ton M747 Semi-Trailer, Low Bed, Heavy Equipment Transporter, 60 ton
M-870 M870 Semitrailer Low Bed 40 ton and variants M-870 Semitrailer Low Bed 40 ton and variants
M-1000 M-1000 Semitrailer Low Bed 70 ton Rear Loading M-1000 Semitrailer Low Bed 70 ton Rear Loading