With a leveling kit you will be able to fit a 305 series tire if you want, 305/70/17 is 33.8" tall, 305/65/18 is 33.6" tall and 305/55/20 is 33.2" tall. Just so you get the idea, I'm running 305/50/20 (32.1" tall) I had the same wheel and tire combo when I had the leveling kit on as I do now with the truck lowered 2".
Lifted:
Lowered:
Lifted:

Lowered:
