34s seem to be the max you can go without lifting or timing. Some people seem to be having luck with 295/70r18, which is a 34.25" tire. Others go with 285/70r18, which is a 33.7" tire. I'm running 285/75r18. It's a 34.8" tire. I had to do a mud flap delete to get rid of most of the rub that occurred in turns. The very little that remained was in the rear corner of the wheel well liner at full lock. That went away when I rotated the tires at 5,000 miles. I stayed with the Duratracs in the larger size. They aren't a bad tire. A little noisy when worn, but decent traction. There is a new brand design with the Goodyear Wranglers called Duratrac RT. The hope is they're quieter. Too new for anybody to know yet, but allegedly 3 peak certified, unlike the stock Duratracs that came on the truck.Retired 2 years ago. From Texas and picked up a 2019 LT Trail Boss about a year and a half ago. Looks for a bit larger AT tires but don't want to lift or trim. I'm thinking KO2s bit don't know what size I could get away with on 18in stock wheels. As long as they are quieter than these loud wranglers they came with