Thanks for the responses. Sounds like Ranger is the best bet. Also good tip on the 0 point classes being able to be changed, that is really handy!

Quote Originally Posted by cichard View Post
u should never really need an offtank in any 5 man instance if ur needing an off tank ur doing something wrong. at most u need a healer and a support like archon/chloro most of hte lower instances got a way with just using 1 tank 3 dps and 1 heals once i hit FC i started using a chloro/archon and cleric worked out alot. all the tank classes have abilties to handle more then one target.
You might have missed the bit where I am playing a trio.

Quote Originally Posted by Alge View Post
Off-tank is nice in Iron Tombs for first boss, Caor Ashstone, so you can reset the stacking debuff. But the zero point Ranger pet has no taunt. Other than that, I agree that having a backup healer is a better option.
I am trying to do the quest The Coup in RotF. The first mob comes with about 30 archers that quickly devastate my cleric as the tank can't grab all the agro. With 2 tanks I should be able to get most of the agro so the cleric can get on with healing.