Tall and skinny isn't always best. I run 33 x 12.5" tires. Without ballast, I have trouble, but with it my truck is unstoppable. I found out I needed ballast the first time I plowed. I added 4 bags of salt between the wheel wells, and did MUCH better. That was my first season with the tires. The next year, I added sideboards to my truck. I also began carrying a snow blower, ramps, and a gas can along with the salt I need. The extra weight works wonders for traction. Oh, and the tires I have are Cooper Discoverer or Discovery. Basically an all terrain tread like a Goodyear Wrangler. They were on the truck when I bought it, and had a few hundred miles on them.
We've tried several brands of tires, settled on Cooper "Weathermaster" as the absolute best snow traction tire on the market. And not terribly pricey either, I just bought 4 235/75-15 and 4 265/75-16 LT for under $600 mounted and balanced. The Coopers will out push Hakkapelita (sp) and Hakkas get good marks for traction.
If you're in an area wher the is never much accumulation from previous storms you can probably get away with lesser tires, but up here where it may get to 2' sitting on the ground and hardening up, you need all you can get if you get off the beaten track.
We, too, like the Firestone products. They're especially helpful to our Fords when the snowplows won't drop; all you need to do is roll the vehicle over and the plow drops just fine. We call this dual mode plowing.