WT432

I have a 2015 GMC Sierra 1500 Z71 4x4 Crew Cab all stock with 265/65 -18 inch Wheels/rims. I was wanting to raise or level out the truck, but still want a slight rake for payload. I don't want the front higher if i put anything in my bed. I have read many forums comparing the 2 inch RC in the front vs the 2.5 inch level RC changing the front and rear. The only discussions i have seen involve non z71 trucks. For those who have a z71 truck which one do you prefer? My plan was just to do the basic RC 2 inch level in the front and go with 285/65-18 tires, but would hate for the nose to be too high. Should I stick with my plan or go to the 2.5" or find a 1.5" level in the front. Thank you