Bob the lower plate is probably...
Yellow Truck & Coach MFG Co
Pontiac Mich
Not 100% sure but the motor was probably the same as the 4X4 version with a similar body to that which Hanno posted earlier which had GMC model 278, 6 cyl, 248.5 cubic inch 100bhp according to TM9-2800.
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Cheers
Cliff Hutchings
aka MrRoo S.I.R.
"and on the 8th day he made trucks so that man, made on the 7th day, had shelter when woman threw him out for the night"
MrRoo says "TRUCKS ROOLE"