Depends on what YOU want to run.
Stock P265/75/16's are usually rated to 35 or 40 psi.
XL (extra load) rated in that size sometimes rated to 44psi.
Load C tires usually to 50psi.
Load D tires usually to 65psi.
Load E tires usually to 80psi.
Sticker says 32 lbs front and rear, but you can safely run more air pressure if you have a heavier rated tire. Your best bet is to look at the LOAD RATINGS for any tires you want to put on, make sure the 4 tires combined can safely carry more than what your vehicle would ever see when fully loaded (trailer, bikes, camping supplies, etc).
From DiscountTireDirect.com:
http://www.discounttiredirect.com/direct/infoLoadIndex.do
Me, personally...... I wouldn't run anything less than a D rated tire on a full-size SUV. I've got General Grabber AT2's in a 285/75/16 on mine now, and wouldn't run anything rated for less weight.
http://www.discounttiredirect.com/d....do&fl=&pc=32403&counter=0&ar=75&rd=16&cs=285