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The GMC 6x6 was built for the US Army as part of a standardization program begun in 1939, which allowed for only two of each type of vehicle to be considered, and emphasized commonality of parts and accessories wherever possible.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.