I was sent this PDF file containing quite a few CCKW related articles for the 50's/Korean War.
PS Magazine is the follow up to Army Motors and it's started in the early 50's.
What's great about there articles is that they cover the CCKW near the end of its service life... so you read about a lot of long term issues that have popped up. Although the M-211/M-135 were already in service, the CCKW soldiered on through the Korean conflict.