I have done a lot of research on winter tires for our front wheel drive car. The more sipes in the tire the better the traction is going to be gripping the highway and ice, that is why truckers have their tires siped. By cutting slits in the tires it improves tracking in wet, snowy and icy conditions. One more thing is look for a tire that that has a lower mileage rating, that tire has softer rubber which is also better on ice and in the snow. I put on Michelin X-ice3 on the car and wow what a difference it felt like all wheel drive and going up 16th street last winter the wife was weaving in and out of cars, vans and some pickups spinning out trying to make it to the top. Braking is also greatly improved. Michelin does make the 275/60 20" for my pickup so in my checking around I found that the Cooper Discoverer M+S was very close to the Michelins. I put the winter tires on late in the fall and take them off in the spring. A siped tire will not last as long. Goodyear Wranglers ATS Kevlar came on the pickup and were very good when new but as they wore down the harder rubber became ice skates. Another item you may want to consider if you tow anything try and stay with the LT series in stead of the P series, they have more ply's and have a better side wall for towing.
