I don't think it would necessarily have to be all that humongous: Have your tent permanently erected on the sled, on top of the supplies. Not necessarily fully erected; spread out and attached at the bottom (probably / preferably on a rigid floor above the supplies down on the bottom of the sled), but collapsed down on top of the floor or supplies. Perhaps with a solid(ish) "lid" for a roof and collapsible textile only for the walls. Keep your sleeping bag and hammock and other use-every-night stuff in the tent, above the floor or other supplies. If you go with a rigid floor you might sleep on that; if not, you'll have to go with a hammock (which is probably preferable anyway).