I have a homemade "dead sled", I had some plastic left over from the auto racing days, you can buy it from Speedway in rolls.

I also am going to build a cart using either Mountain bicycle wheels or wheelchair wheels. and using some plastic covers to protect the spokes.

I do agree that the cart won't work for all areas, but where it will work,.... I will use it and love it. Since I hunt public land, 4 wheelers aren't an option.