There are several jeepers in my 4x4 club here that run 33x12.50 on a 7" wide rim. They get extra bulge, but haven't lost a bead yet. If you decide to go that wide on a narrow rim, you've got to be disciplined to checking tire pressure, tire wear, and rotate them every 3K-5K miles. I just put my lift on last week and am getting new tires tomorrow. I have the TJ grizzly wheels on my YJ which are 15x7 and I'm going with the BFG 33x10.50 MTs. They will be skinny, but for my 4cyl, I'll not lose as much power as I would with the 12" wide.
C
ps. The rubicon comes with a 16x8 rim. yes, a 16" rim.