The bolt pattern is 5 on 5
You can easily get 32x10.50 (255/75R17) which is what comes factory on the Rubicons. Many Rubi owners sell these pretty cheap when they upgrade if you keep an eye open.. but they are on 17" rims. There are also a number of JK owners running 33x10.50 (285/70R17) with little to no rubbing but this will be dependant on your backspacing.
With aftermarket rims, you should be looking for backspacing between 3.75" - 4.75"
BTW, welcome to WF!