On attack, you need to call in a precision strike on a bunker the instant the AA goes down, as in be looking at the map in a safe place when it blows. If you don't get your shot in first, you'll have to wait, and guys from that bunker will probably be trying to repair the AA. The strafing run is excellent for clearing enemies coming out of a rear spawn, especially if the OIC has map-wide radar up. Just remember it makes 3 passes and takes a while, so don't use it too close to your advancing troops.
On defence, get in a bunker turret. Your passive turret/vehicle regeneration ability makes you much harder to take down than a normal turret, and with an engineer, you're really indestructible. Use the poison gas on enemy approaches, and use the sensor sweep whenever.
Edit: Also, you can't Frago anything, so if you see something of major strategic importance (such as a key gate/roadblock no one is repairing), switch to platoon broadcast chat and tell everybody.