be careful measuring, but there is room for more size.
-With the EB, you have to take your air ride into consideration unless you have removed it.
-The width of your new tire may be more important - when you cut the wheels they scrape on bumpers and trim pieces.
-Back tire is closer to the trim and body than the front tire. The front has more space, so make sure you measure via the back tire.
-Front tire has all the bushings and suspension parts. again be aware of WIDTH.
I do Jeep offroading, and the usual mistake people make is the width, thinking they can put 8.5s or even 10s on a stock vehicle, because 30 or 33 fits outside, but you try to steer, and your a screwed. You can use spacers, but they are not great for your axles.
If I am not mistaken, factory is 265's. You can do basically up to 285s without issue, but the width cannot change unless you remove the running boards at least.