They are actually 33's and actually will be a more true 33 then 33X12.5's. The biggest difference is the width. They are only 10.83" wide but being only that wide, you shouldn't have a rubbing issue on the swaybar with that width. That issue usually starts with 285's.
Saying that, the 33's can rub slightly on the fender when on the trail with the wheels at high articulation. Should have no issues at all on the road though. A leveling kit can fix that. On Quadratec, they have a Teraflex leveling kit for just $130 that should make those tires fit perfect on and off road.