Have you seen any 'game carts'? They are to pack out big game, deer, elk, etc. Sportsmans Guide, Bass Pro, Cabella's, etc may have photos. I remember one that had only 1 wheel.
Trees, logs, brush, creeks, hills, and stuff would limit where something like this could be used. No way it would get to a deer in the woods around here.
Would be good for groomed trails.
Pulling something like this is way easier than pushing it.
An ALICE harness might be good to take some stress off your hands?