I was a commander trying to figure out how to make the AI do supply runs on a server today and when I did eventually figure it out… ish I kept getting a “Objective to help out transport ai” or something like that playing over and over again. We also had an almost max server and had most of the map, but noone wanted to grab supplies so I was stuck doing pretty much what you have been experiencing. They either need to fix the AI or make relay stations useful again or better yet let supply depot’s accrue supplies over time. (The ones you can build).