2008 2500 cummins biggest tire size
#2
really depends on backspacing of your wheels- 33x12.5x17 is the largest without rubbing- you can stuff 35's but may have a bit of kiss at full lock.
#3
exactly, I have 35's on mine. stock, and there is a little rub when the wheel is fully turned to either side. thinking about a leveling kit, wonder if that would solve my rubbing problem.
#4
The leveling kit won’t hurt- the rubbing usually happens on the control arms. You would need to change those out to ensure no rubbing. Leveling kit sure does make it look nice for the money
#5