Tire and wheel upsize - what do you think

Currently running 31x10.5 AT on stock rims. It stuffs under the stock flares pretty good. Can rub at flex and full turn, but is acceptable.

Going to need tires by the end of the year. Thinking about trimming to fit 35's and a bit more aggressive stance.

I assume 15x8 wheels, but what backspace????

What's the cleanest looking trim and flare set up? Any bolt on tube fenders out there worth looking into?

Pics would be great!

4" BS is rec/min. BUMPSTOPS! And trim as much as needed in the front, I really like Flexy flares. Be careful trimming in back so you do not separate the pinch seam unless you can fix/weld it.