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go with an agressive set of 33's
You can run 305/70/18's, which are a touch under 35". 285/70/18's are a little over 33 -1/2.
This link has a pretty handy calculator:
http://robrobinette.com/tire_diameter.htm
I'm running 35x12.5s with just tt, nothing in the rear. removed the lower portion of my front bumper as it was catching a little bit though. The tires I have are really agressive and wide. In a side to side comparison they are much wider than my buddies Mud Terrain KM2's of the same size.