I disagree unless you are speaking of Saigon to Long Binh type routes. Tell me all about the Pleiku to Duc Co convoys. The Ban Me Thout to Duc Lap? How about YOUR MOS? Mine is 31542.
From LB to Cu Chi gun trucks and M-114’s seemed common. I was AF but assigned to an Army advisory team,. It was interesting to be able to see a lot just having a regular job would not have enabled one to see. I was at Pleiku a few times. My understanding was that the convoys supplemented air delivery being used for bulk items such as engineering materials.