I use a boat winch, a pulley over a tree limb, and some rope with four hooks. I don't really like the four hooks part ( I hook two in the corners where the doors would be, and two at the back corners of the top) and it was meant to be temporary until I fabbed up something better, but it works and I've never gotten around to making something better. I'm sure with a little thought and some tubing you could rig up a frame like the ones they sell.
Check out my
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CJ7 - God's gift to the masochist.