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I'm guessing access (or stealth) is the reason for not using a loader.
I used to use an old concrete form to hand load 100-200 pound boulders into the back of a pick up. I'm not sure if you are limited to doing this as hand work, but I was twenty five years ago. The form was basically an inch thick piece of plywood 8'x2' with 2x4 framing and a 2x4 @ 2'o.c.. I'd ramp it up onto the tailgate, roll the rock part way up, and then lift the lower end and slide the whole thing into the truck and roll off the rock.
Of course between doing those rock gardens back then, concrete form work in the winters, and Keystone block later on, I'm walking like an 80 year old from time to time. This is one of those times.
I thing using a ramp with the same type power winch you might see on a four wheeler would do the trick. Sliding up a ramp (like an oily form board) is better than trying to lift them straight up. Less power and less disasters if something lets go.
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