For the different IFV variants I noticed there are hatches close to the APS launcher units, so maybe it can be replenished during lull in action. For the tank it is probably not convenient/safely enough for crew to venture out further from their compartments to replace the spent munitions, hence the tank has 2x4 while the other vehicles have 2x2.
The PLAAF already has a network centric operation mode in terms of interconnected radar assets that share info. I wonder if the same can be applied to the ground vehicle's lidars and millimeter wave radar of the APS units, meaning that the radar are not only for self protection duty but actively scans the environment the convoy is in. The commander can see the result of not only his own scans. but that of the other vehicles too, and relay them to other vehicles, or even the higher command can see overall picture formed by these networked sensors.
While the same can also be made of the CITV it's probably better not to interfere with the commander's own use of the system, but millimeter wave electronically scanned arrays are much more flexible in regards to share/networked use.
