http://en.wikipedia.org/wiki/DUKWUsed in landings on Italy and France, also used in later battles, and according to Band of Brothers (the book), used to transport the 101st Airborne on ground some point after Operation Market Garden.
Also plenty given to Canada, British, and Australian armies, Soviets too.
How 'bout it, will it ever make it in FH2? Either as a landing vehicle, same use as Schwimmwagen, or as a supply truck (due to role in bringing supplies to front).