There was also a K-62(-A) operating truck; 607 of all types were built. The Autocar U7144-T or (G-510) was a shorter version of the U8144-T tractor truck, with the same driveline, but with a shorter wheelbase and without the toolbox behind the cab. Nor did it have the U8144's oversize tires – using 9.00x20s instead, and it was rated at 4-tons off road. The model was also built by White Motor Company, who bought Autocar in 1953, as their Model 444T (G-691), and there was the mechanically equivalent Federal G-513. Together, these were the U.S. Army's standard 4- to 5-ton, 4x4 tractor trucks, used for towing a variety of semi-trailers, like the 25-foot and 40-foot, -ton type C-2 flatbeds (for wrecking, moving aircraft, and general hauling), and the AAF type F-2 and F-2A fuel tankers. The U7144-T also towed a trailer with SCR-270 antenna support components. The U7144-T and White 444T had a maximum towed load capacity of 30,000 lbs, and both were powered by the same Hercules RXC 529 cu.in., 112HP, six-cylinder gasoline engine. Autocar built 11,104 of these from 1941 through August 1945, and White built another 2,751 units from mid 1944 to 1945. For all intents and purposes, the White 444T was an exact double of the Autocar U7144-T, in every aspect, and the U.S. Army published not a single technical manual (TM) specific to the White truck. Nor did any of the Autocar's manuals mention the existence of White-built units. Nevertheless, White assigned its own parts numbers for their trucks, so the only official "manual" publication for the White was the SNL G-691 supply parts catalog. Additionally, the Federal 94x43 Tractor, 4- to 5-ton, 4x4 (G-513), was functionally completely equivalent. Although Federal used entirely its own coachwork for the cab, their truck used the same Hercules engine, and many of the same major chassis components as the Autocar and the White; the TM 9-2800 manual for 'Standard military motor vehicles' of 1943 even listed the Autocar (G510) and the Federal (G-513) as two versions under one heading.