If fortune smiles on me I will have to load deer/ a deer with one hand this year. I just loaded my 110lb daughter into the back of the truck with one hand with relative ease.

Using ATV ramps (plywood can be substituted) and a 66" tobagan (heavy duty type) and a come along. I had to stop once and reset the come along was the only issue, only have about 6' of cable on it.

Hooked a strap/rope to the back tie down points in the truck on the first pull, and then hooked the come along to a rope attached to the front tie down points for the second pull.
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Bill