Sleds

I've been backpacking for about 3 years now, and while I did do a lot of winter hiking last winter I did it 100% in boots with my full gear on my back. I got a nice pair of snowshoes at the end of the season and it occurred to me that if I was going to do any real trips in winter a sled would allow me to pull most of my gear and not weigh my back down at all. So I bought a small sled that looks like it will hold 2 of my entire pack. My plan is to take out only a few heavy items, my food bag, my extra sleeping bag, maybe an extra blanket, firewood perhaps? I actually got the sled because it was $40 and a zero degree bag would be like $400, I can't afford that now, so that's why I'm bringing an extra sleeping bag. A 20 degree bag with a 40 degree bag gets me well below zero comfortably.

So my question is am I better off putting 100% of my gear into the sled and just pulling it? My summer rig is 40 pounds with food and water, so a few extra pounds of blankets seems like a super easy weight to pull. So maybe just throw my entire pack into the sled and go? How much weight is appropriate to have on my back while snowshoeing? I'm thinking maybe throw my pack into the sled, then wearing my smaller day pack with water and clothes in it. Any thoughts?

Also any general advice for this up to and including "What the hell are you thinking, just buy a zero degree bag" would be appreciated. Thanks in advance.