I have also confirmed that Kingoapp does in fact root the AT&T Samsung Galaxy Tab 3 SM-T217A. Perfect! :good::good:
Download CWM beta 4 .tar here http://forum.xda-developers.com/showthread.php?t=1526431
use odin v1.85 to put that on your phone through download mode ( hold down volume up and down and power at the same time, when you feel a vibrate let go of...