I have 35" Toyo MT's on Ultra Predator rims that are 20"x 9". The have 5 5/8" of backspacing and a +14mm offset. No rubbing---ever. But then again, I really haven't been offroad, so....
Try to get a backspacing as close to 6" as possible and have a positive offset. :thumbsup
Here's a couple of shots--
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