There are plenty of people complaining about the lack of armor of this tank so first of all don´t use it to hunt down medium and mammoth tanks! The advantage of the stealth tank is stealth! On the demo map drive it in the tiberium field. There you are save from being spotted by enemy soldiers. Then wait for a lucrative target (Often there is a mrls which is not guarded by any tanks.) Blow it up. If its guarded by a tank don´t attack it. They will blow YOU up in no time. First find a isolated target then kill it! Another useful thing is to simply move in front of the enemy Harvester to slow it down and give your teammates the time to shoot it down. But dont shoot at it. Your objective is only the SLOWDOWN and your cover should not get blown. Unless there is no hostile unit in a 100 miles radius If the enemy isnt paying attention on the behavior of the harvester he won´t find out why its taking so long to harvest. Use the same tactic for those coward mammoth tank pilots who attack until they are low on energy and then retreat.(Those "move back and forward" loosers) Let them pass the tiberium field. (Dont get discoverd so keep away from them) Then when your tanks take him under fire move behind him so that he cant retreat. If he is low on energy blow him away.
And if nothing of this things can be done simply run over some soldiers (But pick the 1000$ guys first)

I hope this hints give you some ideas on how to use a stealth tank efficiently. If you have other tips please post.