On my XJ i had 235 r15's and a 2" lift with no trimming. Tires were bad and i upgraded to 31x10.5 R15s. They would rub really bad on a 2" with full fenders. You couldn't have any weight in the back hatch or you would be rubbing on the bumper caps. I knew it was going to happen so i was prepared to trim. I trimmed the front up to the top of the old flare and the back i cut and folded the lip over. I also run flareless and no bumper caps on the rear. I am running a RigidCo front bumper so that opens the front up considerably.
I will run 33"s here soon on about 3" of lift. and some more trimming.
I am running JCR bumpers with some aggresive trimming on 32's. The rear hasn't given me an issue since I trimmed but the front could use a tad more lift, which will happen soon enough.
rear trim in progress
Completely trimmed