A 30x9.5x15 tire on a stock rim will fit quite well w/the two inch lift. You will need to trim about 1/2 inch off the stock bumper (right where the 'L' bracket holds the plastic cover), trim the bottom corner of where the stock bumper bolts to the frame outriggers, and smash/pound flat the seam at the back of the front fenderwell. Then you should be good to go...
One of my personal rigs uses this set up and I think it's one of the best combinations for a Samurai.
-Eric