The following is just my opinion which I am sure someone will correct for me. I am also running the rubicon tires and wheels. from what I remember they have 5" backspacing. I do not rub anything right now. In the future I was planning on getting a tire in the 285/75/16 size, which I think is roughly a 33x11.5 tire. and since my 245/75/r16 are supposed to be roughly 31x10.5, I would think that you would only be adding, at the most, 1/2 inch to the inside width of the tire. Which if did rub, you could put spacers on the steering like many have done before. My vote would be to keep the rubicon rims.