Got a Kawasaki Prairie to use around the far,/ Right now, I have a small lightweight 4ft x 4ft trailer to haul bales of hay from the barn to the pastures. But no more than 6 bales at a time. The trailer only has the tiny 4 x 8 tires. which won't pull through a 6 inch snow. What kind of tow sled can I use. A toboggen?, should i fashion ski's for the trailer?