
The DUKW was the first vehicle to allow the driver to vary the tire pressure from inside the cab, an accomplishment of Speir`s device. The tires could be fully inflated for hard surfaces such as roads and less inflated for softer surfaces, especially beach sand. This added to great versatility as an amphibious vehicle. This feature is now standar....
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http://en.wikipedia.org/wiki/DUKW

2.5-ton, six-wheel amphibious truck used in World War II by the U.S. Army and Marine Corps. Its primary purpose was to ferry ammunition, supplies, ... [1 related articles]
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http://www.britannica.com/eb/a-z/d/81

US amphibious truck of World War II; basically the standard 6 x 6 GMC 2.5 ton cargo truck fitted with buoyancy tanks and with screw propulsion when in the water. Principally used to ferry supplies...
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http://www.encyclo.co.uk/local/20688

The DUKW was an American amphibious truck used during the Second World War. It was basically a standard 6 x 6 GMC 2.5 ton cargo truck fitted with buoyancy tanks and with screw propulsion when in the water. DUKW were mainly used to ferry supplies and men from ship to shore, and played a vital part in almost every amphibious landing performed by Alli...
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http://www.probertencyclopaedia.com/browse/FAFVD.HTM

An amphibious truck used by the Allies
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https://www.encyclo.co.uk/local/20490
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