I have the Mastercraft courser MSR (made by cooper) Tires on my truck that we plow with and tow a roughly 6,000 pound trailer in every snow storm with as we do commercial snow removal. I can't even begin to tell you how much better the winter traction is between these tires and any other all-terrain tire I have ever used. It is very "sure footed".
Treadwear will suffer greatly on dry pavement towing as compared to a standard all-terrain tire, however my tire guy told me the winter tires will be "good to the last drop" in comparison to all terrain tires which start to suffer traction loss in snow when tread depth gets below 40 or 50 percent.
One other thing to consider is tread squirm. Winter tires have a MUCH softer tread compound than all season tires, and have (im guessing) 2 to 4 times the siping of an all-terrain tire which makes the tread quite flexible. While this is great for snow traction, in crosswind situations pulling a travel trailer they might give you an uneasy feeling.
