We had 3' of snow last winter and my m818 on 1600's did ok. The tractors have no weight over the rears so I had to rely on the front axle a lot. If I let my truck sit overnight, I had to let it run for a good while to let the whole drivetrain warm up, the air lines going to the sprag would freeze up and not let any power to the front axle.
Here are a few tips that I learned, I was on the road 20 hours a day during the storms;
-keep plenty of fuel in the truck at all times
-keep a roll of paper towels in the cab for the windshield
-if you find yourself somewhat stuck, do not use the throttle to get you out, put the truck in low range, shift into reverse, slowly let the clutch out with no throttle. If the truck starts to hop, your not going to move and possibly brake something important.
-take a bag of salt/sand with you along with a shovel and you'll be fine.
I hope any of this advice helps, I spent a lot of time on the road last winter.