tanking just depends on your gear.. i like tanking with rogue @ 75 vita with scales as rogue also got 25int to increase the magical defence a bit.. and rogue is still doing nice dmg with backstab/power strike/bottoms up
but mainly get nice ee armors (imo scales>leathers>chains>plates) and stat up to 75 vita and you will be a nice tank.. (if you are going for swords simply use fighter/barb)