A guy in my club was running 33 x 9.5 KO's. It's a daily driver but he hits the trails pretty hard as well. Just this past week he changed them out with 33 x 12.5 KO's. He noticed a huge difference in the on road performance. Much more stable (of course he had a little different backspacing on the new rims also). he seemed to be much happier with the off road performance as well.
I wish he posted on this forum so he could tell you exactly what he liked better about them, but it seemed to be a big two thumbs up!
[FONT=arial black]02 TJ Sahara, Black[/FONT]
33" SSR's w/ 4" susp. 1" MORE MML, 1" BL, HP30 4.10's ARB/8.8 traclock 4.10's, PSC Rocker knockers, skid row skids, jks quicker disco's., AA SYE/ TW ds.