Tried to bomb it with jets and used hell-fire rockets, even with direct hit it deals little damage. Even if you hir all of your rockets, the tank can happly drive further and pretend nothing happend.
Also I shot 3 Titan Launcher missles at it, all 3 direct hit. Not much happened.
The only way I managed to destroy a T-100 was using another T-100 (might be a hint that its firepower is also too high).