I've searched a lot (here & google) & have found too many different answers of 3.5-5 inch bs when using a 325 / 13 inch wide tire (Duratrac). I'd prefer to keep the tires inboard as far as I can. What is the best backspacing to use?

I'm planning on a 3.5 AEV Dual Sport SC lift & stock flares. The JK will see minimal offroad (for now).

What width wheel would work the best (calls for 9-11 inch, I'm thinking 10)?
TIA