I mounted a boat crank chained to a tree with cable on the base of the tree and hung two pulleys chained on a limb. Instead of a 150 angle, I have a 60 and 90, so it really cranks easy. We have small deer, but my 6 year old raised her own doe off the ground. We also spread some used bricks underneath to eliminate a muddy spot.
When we get one cranked up, we swing him over to another hook and undo the first to let him hang "over there".
Clear as mud, right? The boat crank ain't free, but I figure I will have it many years.
stumpy