Today in WW II: 23 Jul 1940 American Bantam and Willys-Overland submit the only two bids for the Quartermaster Corps light reconnaissance and command cars, the origin of the military jeep.  More 
23 Jul 1941 Original World War II contract for jeeps awarded to Willys with Ford added Nov 1941 to increase production.
23 Jul 1945 Submarine USS Barb [SS-220] destroys a Japanese locomotive and supply train at Patience Bay off the coast of Karafuto, Japan, the only known such attack by a submarine.
Visit the Olive-Drab.com World War II Timeline for day-by-day events 1939-1945! See also WW2 Books.

Chart of Military Vehicle Trailers, Miscellaneous

Trailer, Bolster: 4-Ton, 4-Wheel, General Purpose, M796 at Fort Carson, CO, August 2012
Trailer, Bolster: 4-Ton, 4-Wheel, General Purpose, M796 at Fort Carson, CO, August 2012.

Military trailers in the Miscellaneous category are those that don't fit in any of the standard categories.

Vehicle Description Photo Link
Converto Trailer, Dump, 2 Wheel, 1/2 Ton Airborne Converto Trailer, Dump, 2 Wheel, 1/2 Ton Airborne
K-37 See M310 Cable Reel Trailer  
K-38A See M367 Cable Reel Trailer  
Athey
Track Laying
Trailer, Athey, Track Laying (G-123)
Three models, 6 ton and 20 ton.
Trailer, Athey, Track Laying (G-123)
M-7 M-7 2-ton, 4-wheel, low profile generator trailer (G-221)
Series of utility trailers including the M-7, M-13, M-14, M-18, M-17 and M-22.
 
M-271 M-271 pole transporter (G-782)
Signal Corps V-13/GT
 
M310 M310 Cable Reel Trailer, 3 1/2-ton , 2-Wheel (G-813)
Signal Corps K-37 or K-37B in WWII
M310 Cable Reel Trailer, 3 1/2-ton , 2-Wheel (G-813), Signal Corps K-37 or K-37B in WWII
M367 M367 Trailer, Maintenance, Telephone Cable Splicer, 1/4-ton, 2-Wheel
Signal Corps Model K-38A
M367 Trailer, Maintenance, Telephone Cable Splicer, 1/4-ton, 2-Wheel, Signal Corps Model K-38A
M-448 Trailer, Shop Van. Mobile paint or battery shop based on the M103A3 chassis  
M-798 Trailer, Bolster.