I'm new to snowmobiling and last week I learned an important lesson. Always carry chains. We left out last Friday with great weather and a clear trail but by the time we got to Farmington canyon it was snowing hard. While towing my snowmobile up the trail my truck suddenly went from 4wd to 2wd. Needless to say, I'm on the side of the mountain and not going anywhere with two other trucks behind me. Luckily another guy in our group had chains and I was able to make it the rest of the way up the mountain in 2wd w/chains. Turned out to be the 4wd actuator that went bad, so it was an easy fix. Lesson--no matter what you drive or what the weather is when you leave out--be prepared for the wost. Lesson learned...