I helped a guy out with an elk in Montana. The cart was called "Mother Of All Elk and Deer Carts" with the motorcycle wheel and a hand brake. We had an entire elk on it and it was only about 3 miles of pushing but it was pretty easy pack. BTW, I tried to get him to bone it out and he said no...
Pushing/pulling that thing up a coulee while side hilling it was not that easy.