RE: Anybody use one of those deer carts?
YES and they work great. Have used them in PA dragging off State Game Lands. Make sure they have quality wheels, mag type (like Tuff Wheels when we were young BMX'rs) . A regular rim will be beat to a useless pancake in no time. Trust me, we built one our selves before they were on the market, and in a short time, our first attempt, turned into drag the deer, go back and drag the cart!
Another good thing I used last year was a deer sled.