Which tire size?

[chevyman14]

I'm thinking of getting a Rough Country 3.25 in. Suspension & Body Lift Kit with 255/70r18s.  Is this tire size good, or should I stick with the stock size of 265/65r18?

Also, what is the biggest tire size I can go without rubbing?

I'm a weekend off roader, truck is a daily driver.  I put ~50 miles on it a day between work and home and running around.

I understand thinner tires are best for regular off roading.  My last truck was an '05 silverado with a 2" leveling kit and I stuck with stock size and never had an issue, but thinking of running 255/70's this go around.

 

My truck is a 2014 5.3L V8 LTZ Z71 Silverado.

Will be getting Falken Wildpeaks A/T3W's.

 

Thanks for the assistance!