For a high strength tank (who has 3 levels of Rogue in his build) what is the best weapon to focus/specialize in, and am I better off dual-weilding or using a two handed weapon?

Please list a few good options, as I am playing with a few tanks.

In IWD2, it's pretty straight forward.

High STR tanks are better off with 2H weapons over dual wielding, due to the 50% damage bonus that 2H weapons add.

Dual wielding is better for low to mid STR characters, who will not get much or any benefit from the 50% 2H weapon damage bonus.

As to which specific weapon types to specialize in for a high STR tank ... go for 2H swords. It also is good to have some skill with some blunt weapons as well, for those times when you have to deal with foes with resistance to edged weapons or are vulnerable to blunt weapons.

AXES!

Halberds for a dude who isn't GOOD.