Try this site I found it to be great, I have been looking and trying to decide on a tire wheel combination and have done all my calculations on this site first before talkign to any dealers about either tires or wheels and for the most part i am more knowledgable than they are LOL.
To answer your question with a leveling kit 285-60/65-18 to be safe and 18" wheel with a 0 to a +20 offset and backspacing around the 5" range Wheel / tire size calculator / comparer - RIMS-N-TIRES
Later Phil
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