Today in WW II: 7 Dec 1941 Japanese attack US Navy at Pearl Harbor, Hawaii, sinking or severely damaging 18 ships: 8 battleships, 3 light cruisers, and 3 destroyers .  More 
7 Dec 1941 Japanese declare war on Britain and United States.
7 Dec 1941 In North Africa, the Afrika Korps fell back to El Agheila, halting their retreat and the British Operation Crusader advance there.
7 Dec 1944 US Army units land at Ormoc Bay, Leyte, Philippine Islands cutting off the Japanese ability to reinforce and supply Leyte.
Visit the Olive-Drab.com World War II Timeline for day-by-day events 1939-1945! See also WW2 Books.

Chart of Military Vehicle Liquid Tank Trailers

M-149 Water Buffalo, a 400-gallon steel tank sitting on a trailer chassis, Joint Base Andrews, MD, May 2011
M-149 Water Buffalo, a 400-gallon steel tank sitting on a trailer chassis, Joint Base Andrews, MD, May 2011.

Military vehicle trailers for fuel and water consist of a tank mounted on a chassis. The capacity of the tank may be small or large depending on the intended use of the trailer. For example, the trailer tank may hold a few hundred gallons of water to supply a small unit in the field. Or the tank may hold thousands of gallons of jet fuel for use in refueling aircraft at an air base. Since the word tank is ambigious, these trailers must be distinguished from trailers whose purpose is to carry or retrieve armored vehicles (e.g. M4 Sherman tank).

See also the chart for Semitrailers, Tank.

Vehicle Description Photo Link
G-527 Trailer, Water, 250 gallon, 1 Ton, 2 Wheel (G-527) Trailer, Water, 250 gallon, 1 Ton, 2 Wheel (G-527)
M-106 M-106 Trailer, Tank: Water, 1 1/2 Ton, 2-Wheel, 400 Gallon (G-754) M106 Trailer, Tank: Water, 1 1/2 Ton, 2-Wheel, 400 Gallon
M-107 M-107 Trailer, Tank: Water, 1 1/2 Ton, 2-Wheel, 400 Gallon (G-754) M107 Trailer, Tank: Water, 1 1/2 Ton, 2-Wheel, 400 Gallon
M-149 M-149 Trailer, Water, 400 gal., "Water Buffalo" M-149A2 Trailer, Water, 400 gal. Water Buffalo
M-1112 M-1112 Trailer, Tank, Water: 400 gallon, 1 1/2 ton, 8 wheel "Water Buffalo" M1112 Trailer, Tank, Water: 400 gallon, 1 1/2 ton, 8 wheel Water Buffalo
MTVR Water USMC Medium Tactical Vehicle Replacement (MTVR) Water Trailer (MK149) USMC Medium Tactical Vehicle Replacement (MTVR) Water Trailer (MK149)