The Studebaker US6 was the contemporary of the GMC 6x6 ‘Deuce and a Half’ and due to standardisation was not adopted as the main transport truck used by US Forces in WWII but instead formed the bulk of supplies to the Allies under the Lend-Lease program, most notably the Soviet Union that received large numbers of Studebakers.
The truck proved to be extremely reliable and robust being well liked by its operators and was also used by the Soviets as the basis for some of their Katusha rocket systems as well as many being captured and used by the German Army.