To extend the jeep's luggage space, the simplest, and frequently used method was the addition of a rear baggage rack. In exceptional cases, units would actually stretch both body and frame of a jeep, to give it more passenger and luggage space, but for this usage, a Dodge WC model was available in many cases. Nevertheless, building stretched, 6x6 jeeps with ton cross-country payload, was explored with much interest. As early as July 1941, after the unsuccessful testing with the T2 and T2E1 37mm antitank guns mounted on Bantam jeeps, the U.S. Quartermaster Corps (QMC) thought to lengthen ton jeeps into 6WD for specialized roles, including the 37mm gun. Willys was contracted that month for both a T13 and a T14 Gun Motor Carriage, based on the Willys MA – one firing forward, and one rearwards, like the earlier Bantams. In reality, two models of rearward firing T14 were built, based on Willys "MBs", one slat grille in late 1941, and one or more stamped grilles, by January 1942. Although the Willys T14 was actually found to be the best of several 37mm tank destroyers tested by the U.S. Army, the Tank Destroyer Battalion had by that time standardized the Dodge ton M6 GMC.