[beng]

Also, on further reflection, i think you should change the weaponset to this:

  WeaponSet
    Conditions          = None
    Weapon              = PRIMARY AvengerTargetDesignator
    AutoChooseSources   = PRIMARY FROM_PLAYER FROM_AI FROM_SCRIPT
    Weapon              = SECONDARY GattlingBuildingGunAirDummy
    AutoChooseSources   = SECONDARY FROM_PLAYER FROM_AI FROM_SCRIPT
    PreferredAgainst    = SECONDARY BALLISTIC_MISSILE AIRCRAFT
  End

This will make the tank inside fire faster at ground targets, and if it is a gattling tank, acquire air targets faster.