some people will carry a backpack as well as tow a sled (pulk) in order to keep weight on their back for climbing. An other option is to store your gear in a back pack and strap the pack to the sled upside down. Then when you hit a hill, you can put on the pack for the extra weight. Personally, if I am taking skis and using a sled, I also take snowshoes.
If I wouldn't eat it at home, why would I want to eat it on the trail?