I'm planning on doing a pole barn next year. Being in the concrete business should help me out a ton. A footer isn't necessary at all with a polar barn, but thicken it up at your drive through door. I'd do 8" thick 1' wide from slab edge. It's cheap insurance to keep the slab from busting where...
I'm having GREAT luck out of 37x13.5R20 Cooper STT Pros. Wear like iron, and grip great too. They don't fee like the tread "rolls" like Toyos and Nittos feel to me.
2011 4Runner Limited with a 2"/1" lift. It is 4wd/AWD like the Landcruiser with center diff lock. Atrac. X-res. Nav. We didn't want the 3rd row but you can get it.