We have a 2013 JKU and at the 1000 mile mark replaced the factory 17" wheels and tires for 15" rims and 33" Duratracs which are about 32" tall when mounted and pressured to 25 PSI. The only thing we noticed was a better ride and handling although this now includes a 2.5" TF spring kit and Rancho 9000s. Power wise the 5 SP Auto driven by the 3.6 does a great job on or off road and I have towed a 1700 LB trailer about 350 Miles to the hill country several times. Granted when towing I do not go above 65 MPH by choice not because it wont. I have passed people with the trailer and went well above 75 MPH to do it. We also have had 0 issues with wobble or bump steer. Very very pleased with the 33s.
I will say when tires are due to be replaced next year I suppose, we will be going to 35" tires, and 456 gears front and back. Not sure we really need the 35s its just one of those things we may do and of course they do look good.