I hunt Wilderness areas and I don't have draft animals. I'm not smart enough to shoot them early, either. I carry a small tarp that I run through my Foodsaver so it makes a really compact package.
Start with this:
Gut
Skin
Cut the head off
Leave overnight
Come back the next day with pack boards and helpers
Remove quarters
Remove backstrap and swinging loins
Bone the neck and ribs
Shag it to the truck
You'd be surprised how heavy the bones are.
P