No stranger to being stuck or having to move something too heavy to move without power equipment, I'm not sure how I didn't know about this. Quite ingenious I thought. It's called the flip flop winch. Do people know about these things?
I have seen these before and they are ingenious. My sole concern would be that the tension not be too great, the loan not too heavy and the cordage very, very strong. These simple devices can generate some amazing forces.