I think modern artillery units need to be accompanied by their own dedicated air/drone defense units even if they may be sufficiently behind front lines. It may no longer be sufficient to rely on shoot and scoot tactics as modern adversary can fire shell-delivered drones and loitering munitions to the vicinity of the evacuating vehicles, these assets can then seek out and destroy targets on their own, which would not have moved far from their previous positions.
Modern networked units on the move needs to be accompanied by counter battery radars that can detect incoming shells, calculate their trajectories to determine if they are a threat to any of the vehicle locations of near-by units, then relay this info to formation assigned air-defense units, which will engage only those incoming targets that pose a threat.