This is true. At level, the heals from VE stop being enough to keep an honest tank alive around the Underbog.
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You don't even need the tank ;-) http://www.dual-boxing.com/showthread.php?t=27670
(well to be honest after 70 I kind of hit a wall with my 5 priests... can't do UK with them... but doing shattered halls was quite an accomplishment... worse the trip... and if I ever finish the grind, they'll be fun in PVP)