Just to clarify what I had in mind.
I currently spend some of my time in anti air weapons and the "load supplies" button is annoying on the Wirble, Ostie, M16. These do not have an ammo counter on the sight. I haven`t tried all GV-s. If someone drops vehicle supps I usually do not take them right away, because someone else may need them more than me. If there is a battle going on and supplies being dropped then the "load supplies" hangs around for a long time. I am not certain, but this could also be an issue on other vehicles with MG-s.