Just as a frame of reference, when I ran SCS wheels (8 inches wide and I believe pretty significant backspace), I did rub with LT265/70R17 Falken Wildpeak AT3Ws, but not on the body mount. Needed to scrap my mud flaps and do the fender liner mod, but was able to get it under control.
From what I can tell, the road to hell is paved with wheel spacers
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