Currently running slightly over 33" Nitto Terra Grappler G2's on Rep Snowflake 22's on the Sierra. I love the Nittos. Although expensive. I still have my 22x12 Hostile Alpha's with 33x12.50x22 Toyo Open Country AT 2 Xtreme (I think, they are very knobby) that i had on the silverado and I definitely had no complaints with that setup. Not very loud and smooth ride. Undecided as to whether I will try to sell them or put them on the new truck some day. They only have a couple thousand miles on them, so are basically still new. Both the NIttos and the Toyos have been great.