Capstan rope winches work really great for pulling elk and moose. I have one made by Speedwinch. Its 12V and connects to my trailer receiver hitch. It has a foot switch and is really easy to control. The gas versions I have seen are more difficult to control. I use 600 yards of amsteel blue rope. I have pulled game up really steep hillsides with ease. Make a retrieval fun. They are pricey but are totally worth it.

Here is a link to their website. They have a pretty good video on their blog page here and I think they have a YouTube channel also. www.speedwinch.com