I hunt quite a bit in the winter and frequently use a sled where the terrain/conditions permit. I fasten the sled to an internal frame pack belt which place the weight /balance where I like it. The sled should be no wider than an average snow machine track as those tracks make for easy travel. I would always carry some sort of crampons and rig a knotted rope as a brake for downhills. You Tube has lots of good rigging and setups for expeditions that you may find useful.
mike r