265/70-16 if you don't want to lift it. 265/75-16 or 285/75-16 if you do an inexpensive TT/shackle lift.
My old '05 on 265/75's and a TT/shackle lift. It didn't have step bars so it looks a little higher. I always thought my wife looked hot when she was driving it. :driving:
I just put 265/75r16's on my truck today. going to do a TT lift next week and hope to find a place that has the shackles.....or see if I can have them made here.