Thought I would throw in my 2cents...

Been a while since I have been active in the community, just got busy with work. Trying to get back into it

Anyway.

I used to 5box 5 Death Knights through most Heroics back in the day with all of them being a hybrid tank/dps with Frost Presence up with absolutely crap gear. None of them were Hit caped, nor Defense caped, or had any professions.

Really, it was just general knowledge of how to play the class and setting the right macros for most, if not all occasions that can happen in a dungeon. Now that I look back at my play style, macros, gear and such. I have no freaking clue how I pulled half that stuff off. If you just keep a cool head, know the fights, and have the right macros, most any dungeon is doable even ICC raids.