Interesting read, I would be curious if there is a difference between the AT and MT tire. The one part he didn't cover(or I missed it) was about the wider tire adds more stability in off camber situations on the trail than a narrow tire will. A 12.50 tire will yeid 1"(generally) more wider stance than a 10.50 on the same rim, unless you compensate with a different offset rim(but then you give up the ability to put a narrow taller tire ion a rig using less lift.

I myself run 33x12.50 AT's on my DD/trail rig for all conditions. I get the grip and handling on the highway, the flotation needed for the snow 6-8 months of the year 4x4 trips, and enough traction on the rocks the other 4-6 months of the year. I have ran 31x10.50 MT's and I didn't care for the digging prperty of them off-road, or the walking out in hard cornering on the road. In a perefct world I would run 12.50's AT's on the street 14-15.50's AT's in the snow and 12.50 MT's in the rocks, better tracction when exiting a water crossing, and better grip on an edge. However that is about $3000 in extra tires and rims.