Can always go with 34" (305/70r17). I think they fill the space better than the stock 33" and no rub at full articulation. Tire choice is a bit more limited though.
For me its really how you feel about the look of your stock wheels. If you like them a 305/70r17 mounts perfectly and get no rub at full articulation. 315/70r17 works well for street and mild trail use.
If you want the look of a different wheel then their a lot of options to go with, but you...
Just purchased this after reading and researching all the recommendations on the thread and its perfect. I have the model with the hammock, but instead buckle the bottom to the seat mounts for a secure fit with top off and windows down. Covers the entire seat and the side. Would highly recommend.
I have 305/70r17 Ridge Grapplers that are E rated on my JLUR. They ride as well if not better than the KO2s once you find the right pressure which is about 32 psi for me.
Seen mixed information on 315/70r17 at full flex. I am currently running 305/70r17 and wheeled a few times now with zero rubbing. Take that for what it is worth.