With the 18in stock wheel on my OB I've seen people say the 235/60 r18 Yokohama geolanders/falken wildpeak A/Ts work. I wish they offered a 17in wheel to give some more breathing room without having to shell out extra cash or find someone to trade. I'll probably toss the yokos or falkens on eventually. I probably wouldn't push it much past those without getting a lift, but I'm on the cautious side.
Picked up my BS Big Bend today from the dealer with 245/65r17's Falken Wildpeak A/T3W, no lift. Drove home 300 or so miles. Rode great, can't hear much road noise but can feel it. I wanted to biggest possible without lifting.