Yeah they are definitely going to rub on the trail, I would say. I'm running P285/70R17 Duratracs on 17x9 rims with 4 1/4 inch backspacing... and they still rub on occasion with a 3 inch lift.
I think a Bigger concern with the combination you're proposing below is that you're likely to encounter some shifting issues if you're running an automatic transmission. Unless of course you have a tuner already to reprogram the shift points for those tires.
'12 JK Sport, 5spd auto, P285/70r17 Duratracs on 17x9 Trailmaster steelies, 3" coil-lifted, "DV8" bumpers, Smittybuilt rock rails, K&N w/Magna-flow exh, TrailDash 2’ner, CB, no lockers, Warn VR10, carbon fibre "no its not a wrap" cowl hood