Old age was also a factor in me finding a better way to load animals into the bed of my Rhino. I didn't like the idea of having to drive back to camp to get a hitch hoist or bungee one in the bed as mentioned by Cajunrotor.
I decided I was getting to old and crippled up to be climbing in the bed of my Rhino to hook a pulley on a tree limb, drag my deer or pig under the tree, hoist the animal with the pulley, back the Rhino under the animal and lower it into the bed then climb into the bed, with the animal, to retrieve the pulley system.
So here is my solution. I open the tailgate, tilt the bed and tie the animals legs together. I now have a 4 strand rope with a loop on one end and 4 meat hooks on the other end to connect the legs together. Much easier than tying the legs.
I then run the other end of the rope through the pulley and tie it off to a boat cleat so I can drag the animal to a near by tree.
Next I tie the end of the rope to the tree as high as I can.
I then drive forward until I see hoofs at the pulley.
I close the tailgate, push the bed down and lock it in place, back up, retrieve my rope end from the tree and my animal is loaded. The pipe on the back of the roll cage with the eyelet and boat cleat stays on the Rhino. The only other things I have to carry for this system is the metal arm with pulley (needed so the rope will clear the top of the bed when it is tilted) the 4 strand rope with meat hooks and a long rope. I carry these in a bag of tools under the driver seat.
Have used this system for a couple of years and has worked very well for both deer and pigs.