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 rearward, 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, by that time the M6 Gun Motor Carriage (based on the|Dodge ton) had been standardized for the Tank destroyer battalions. Nevertheless, the QMC and Willys kept developing the ton 6x6, in various versions, as the "Super-Jeep". By March 1942, the T14 GMC was revised as a cargo / prime mover, named Willys 'MT-TUG', that could compete in some roles with the ton Dodges. The Army tested these in various configurations, up to a 1-ton rated version, as a light, multi-purpose tractor truck, cargo, or personnel carrier. For the United States Army Air Force (USAAF), several MT-Tug units were built with a fifth-wheel coupling on the cargo floor, for various Fruehauf trailers, and loaded with sandbags on the cargo bed, even as aircraft tugs. The Marine Corps also wanted a beefier truck, using standard jeep components, with a higher fixed side body structure, as a personnel or mortar squad carrier, or an 'MT-CA' field ambulance. The Willys MT models had the same ton rating as the new for 1942 Dodge WC series, but weighed only , with a range, and a top speed of . Willys pointed out that every 6x6 'Super Jeep' would save of steel for their construction, as well as 40% in fuel usage, compared to the Dodge trucks. Moreover, it comprised 65% unaltered standard jeep components, and many of the other parts were also just modified standard jeep parts. By January 1943, the Willys MT-TUG was further evaluated by the Army Transport Command at Camp Gordon Johnston, FL. It was positively reviewed there for its effortless operation in deep sand. Although the Willys ton's performance was even called 'exemplary' by some, the U.S. Army nevertheless abandoned the Willys MT in favor of the already produced ton and 1ton trucks, because the Willys was 'surplus to requirements'. Fifteen 6x6