The U8144 had a similar chassis, with van bodies by York-Hoover—607 were built for use of the SCR-270 early warning radar system by the U.S. Signal Corps.

As part of the same family, over 11,000 of the U7144-T, and some 2,750 of the virtually identical White 444T were built to serve as rear area tractor trucks to haul semi-trailers, ranging from flatbed to communications vans.

[7] In the late 1930s, as the war approached, the Autocar Company, that had been selling trucks to the U.S. Army since 1909, began adapting their commercial cab over engine (C.O.E.)

"[12] The first in the range was the 2.5-ton model U2044 truck, with a 320 cu in (5.2 L)[13] Hercules JXD engine with an output of 84HP—but once equipped with Autocar's own 377 cu in (6.2 L), 100HP, six-cylinder gasoline engine, the trucks evolved into the U4000 range.

[9][14] The model U2044, U4044 and U4144 trucks were all built by Autocar as cab and chassis, with third-party bodies, as 2+1⁄2-ton, L-1, 660 gallons, Oil Servicing tankers – 371 units in all.

G-635) was also powered by Autocar's 377 cu in (6.2 L), 100HP engine, but had twice the load rating as the U4144-T. Only 97 were produced in 1940 and 1941 – primarily as a line haul tractor to tow fuel trucks.

[22] The ladder frame had a 21 feet 11 inches (6.68 m) wheelbase with two banjo style live beam axles on leaf springs.

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.

[35] 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;[36] 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.