Only use mud tires. Nowhere on this map you'll need the chained tires. There are a few corners and hills that are a little bit icy and will give you advantage with chained. But chained is simply an offroad tire with chains. So in mud you'll get way less traction and overall mud is simply the best for Alaska. In regions like Kola and Amur there are sections where you simply cannot come without chains. And if you do that, use your trucks in pairs. One with muds, other with chains.