You and I have the same problem, last winter I was running Michelins for daily driver duty and it sucked. I bought a set of used 37X12.50R17 BFG A/Ts that were half worn (take offs from a Hummer H1 civilian truck with alloys) and some FJ Cruiser wheels, the ATs were excellent. I could not go any smaller than 35 due to the gearing, and I have some weight to deal with the wider tires. I also ran 500 lbs of sand in the box. The problem is 12 inch wide rubber is going to be a lot for your truck (no weight), you would ideally be a lot better with a really narrow tire. Getting a set of stocker unlocked diffs with 4.10 gears and swapping them out might be cheaper than getting a set of blingo 1200$ tires. I found Yokohama Geolandars (315/75R16 - 34.5 inch diameter) for sale on Ebay:
http://cgi.ebay.com/ebaymotors/4-NE...temQQimsxZ20081029?IMSfp=TL081029109013r26330
Pricey, though. I'd personally rather buy ATs and have streetable tires for the summer too.