I have a 2.5" Rough Country Leveling Spacer with 285/70/18 (34.1") Toyo Open Country M/T's. With proper rotation it's estimated to get between 50-60k out of them. It has been plenty for anything I have ever thrown at it. (Great for trail riding out to hunting grounds and those sticky situations)
Here's a couple pics of what mines looking like.
( I know mine is an 04-08 body style, Just wanted to give you some visual options)