I would say you want them. I put 2" on my JK and went up one tire size. It looks so much better without looking modified.Do I need wheel spacers for toyo open country a/t 35x11.50 17? Got someone selling me a set of 4 for $800 with only 7k miles on them. seems like a good deal to pass up.
Any idea if a rough country 3in level kit pulled from a gladiator will work on wrangler?I think that you would need spacers as 11.5" in tire width is a bit more than the stock setup even on a Rubicon (not so sure about the XR package). You might even need new wheels, in which case the spacers wouldn't be needed if you pick a wheel with the right offset and backspacing.
And you will want to lift the Jeep a bit if you haven't yet, too, or else you'll rub the fender liners when flexing.