terrain, tire and rim selection will dictate the tire pressure you will run.

i am a rock crawler & i run 35 / 12.50 / 15's on a rim that is 8" wide. i typically air down to about 9psi. my buddy that runs bead lock keeps his about 3-5psi. when i had rims that were 10" wide i was having problems with "burping" air from the bead at 12 psi. IMHO a fully inflated tire is more prone to being punctured as it is not going to flex. thing of a fully inflated balloon and how easily they pop, but with it half inflated it is more yielding. for research purposes, go out to your jeep and measure the bumper height front and rear. air it down and measure again. it will be a nominal difference. a tall sidewall like i have (10") will have more flex and will have a larger difference from fully inflated to aired down. but with a larger rim size like 17" and a 32" tire (about 7") will have much less difference.