T was Chrysler's truck engineering code.
As far as I can tell, all the army engineering codes were T2xx for 4 x 4 and 6 x 6 vehicles, starting with the
T202 and T203 VC and VF in 1940,
and going up through
T207 / T211 / T215 half ton 4 x 4 WCs, 1941 / 42
T212 Canadian half ton D8A
T214 3/4 ton WC up to 1945
T223 1.5 ton 6 x 6 WC up to 1945
I've no idea what the T codes were for the D15 and D 60 - anyone know? and I should point out that where the vehicle was basically civilian pattern with army adaptation they stuck with the civilian engineering code, like T112 to the WC 3x and WC 4x half ton 4 x 2 trucks.
The truck with the T233 engineering code was a prototype big jeep, Fred Coldwell has this survivor;
but a typo is much more likely and they really meant the T223 vanilla 6 x 6 Weapons Carrier - as you can all count the real T233 had but four wheels......
Gordon
(- alledgedly knows about Dodges but no-one ever asks)

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