For years, my grandfather and father tried game carts, ropes, winches, sleds, etc. Save yourself some time and effort, get a good packboard, or backpack and knife, and learn how to cut up game. The gutless method works awesome.
We would pass up a lot of big bucks when I was a kid, because they were "too far in". My grandfather would always say, "better bring your frying pan". Years later, my response was, "I don't need a frying pan, I have a knife". Seriously, cut them up. I used the gutless method on a deer, that was only 1/2 mile from a trail head, down hill. We had drug them from near the same place in the past. There is no comparison, cutting them up is way easier.