As GLA Dr. Thrax, upgrade to Anthrax Gamma. After that, you will need four Battle Buses. Fill two of them with Toxin Rebels and the other two with RPG Troopers. This force will be very difficult to defeat because the Toxin Rebel buses
will destroy all infantry in range, while the RPG troopers will destroy every tank, aircraft, and even most buildings very easily. Also, they can attack from behind and in front at the same time.