Mud Tires and Rims for 2009 Hummer H2 SUT?

Right now I have a 2009 Hummer H2 SUT special edition with 34" street tires but I'd like to change those out for something along the lines of an 18" rim and 35" mud tire without lifting the truck. I was wondering what type of rim/tire looks best on a hummer and what width/circumference can fit on a stock height, because I don't want to lift or level it.Mud Tires and Rims for 2009 Hummer H2 SUT?I would go to the tire store and they could tell you.