like mentioned, 'wind chill' only applies to things that can sweat. The evaporating moisture from sweating removes a lot of energy, making the sweating object colder than the ambient temperature.

Towing it will help it cool off quicker, but it won't go under the ambient temperature. Unless you were spraying water on it and the RH was low enough that it was evaporating and not forming ice :p

Carbs icing over has to do with the temperature, RH, and dew point, IIRC.