Sorry, I'm a dummy and screwed up the first one.
a polyethylene plastic sled makes work easy in the snow. even if you've already de-boned or quartered. it doesn't work too well in the steeps though. that stuff is slicker than snot on a brass doorknob. we use those to transport patients sometimes and they will run you over quick on a slope.If you are dragging any animal more than a couple hundred yards you are working way too hard. It is easier to pack it.
Ive aged meat in a cooler a few times. I cut, de bone and remove fat from the meat and hang it in game bags over night so it cools down and dries out some. I then take the game bags off and put the quartered meat in heavy duty black garbage bags. I then put them in a cooler add ice and open the drain plug. The meat will stay pretty good as long as you keep ice on top and it doest get wet. I butcher when I get time. I've had deer meat in coolers in august for up to a week without any problems.The only problem with that is not being able to hang your animal and let it age. Aging really does make a difference when it comes to how tender your meat is.