RE: Narrow vs Wide Tires
Ron's point is well taken.  The narrower tire, assuming the right tread
pattern, will do better in mud and snow.  Simple reason: Less resistance
when cutting through the mud or snow.  This reminds me of an anecdote from
the past.  An officer in the post WW2 West German Army was asked why all the
German Army trucks had high, skinny tires and wheels on them.  His response
was "So we don't get stuck in the mud the next time we head for Moscow".