Though the main focus of Frozen Skies is obviously aviation, there are other aspects of Alyeska that may appeal to players and some have been mentioned previously. Though aviators and their aircraft are considered vital, there are those who consider themselves equally important if not more so at keeping the lifeblood of trade in Alyeska going. Theirs is a less glamorous life trekking across the frozen wastes, fending off beasts and raiders alike to help keep the flow of commerce open. These are men, and women, known as Free Traders.
http://www.utherwaldpress.com/2016/11/trial-of-commerce.html
What sorts of ground vehicles/animals would the Free Traders use? Just the muletracks, or do some actually use beasts of burden/other vehicles? :)
It would depend on the terrain.
Tracked vehicles like the Mule tend to be all-rounders, motor trucks would be more ideal in areas where there is something closely resembling a road network. More mountainous areas with narrow paths would need beasts of burden like horses, donkeys, mules, dog sledge and tempered bodarks.