You remember this hanger queen, don't you? Standard US halftrack with a canon on it? I remember taking one of these out only one time, quite a while ago. I drove it to the top of a hill over looking an enemy base to get LOS, then was promptly popped by a passing fighter. With no armor and a very limited traverse on the gun, this is clearly not very useful in the MA. However, allow someone to take one out with a couple more as drones (similar to bombers) and use it as an indirect-fire mobile artillery battery, using "Land" mode fire direction and the clipboard map (like AH ships do) to target an enemy base or position, and now you have a legitimate use for it in the MA. Use a spotter to call your shots long/short/left/right, and it becomes a pretty effective tool.
Restrict the load out when in "formation" mode to HE and smoke ammo, and make it a requirement that you be stationary to fire in indirect fire mode. Maybe even perk it's use as a formation. Perhaps make it so that, when moving, the three tracks are in line, with the player driving the lead vehicle. Once a player reaches their preferred firing position and facing, they stop and hit the "deploy" hot-key. The drone vehicles pull up beside the lead vehicle, facing the same direction, and only then can their guns be unlimbered and fired. If the player moves his lead vehicle, indirect fire ends and the drones fall back into line-a-stern and follow. This makes them very difficult to use against other vehicles in a direct-fire engagement. Just looking for an easy way to add mobile artillery to the game, using existing assets and code to the max extent possible.