I contend from the photos and motor that it should be an Autocar U2044 which was the 2-1/2 ton tanker. This model utilized the JXD 5.2 liter engine.
By calculating and converting the bore and stroke (4"x4-1/4" x 6 cyl) I come up with 320cuin or 5.2L respectively.
The U4044 was a 4 ton version used as a semi tractor.
The tanker model was particularly used by the USAAF in WW2.
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