Bumper markings

[halifaxgroup]

I have a number of photographs taken during the Korean War. One picture has an open cab CCKW with the following across the front bumper.
351GP-55T 74-208

The number 208 is painted under the drivers position as well.
Truck number 208 is obvious. I assume that the 351 is the 351st Highway Transportation Group. Help me fill in the blanks.

I also have a picture of an unarmored Dragon Wagon

Looks like 69 or 59 GP 30-O

I assume 30th Ordnance Battalion. But I cannot find out if the 30th was with the 69th or 59th.

Any connection higher up, say 8th Army for example? An Infantry Division?

Pictures taken about April 1953.

Thanks. If I can identify I will send them to Supply Line for publishing.