It may not be very convenient, or what you're looking for, but years ago we made a self-contained portable winch for use around the farm, cottage, hunt camp, etc.

It is a deeply reduced chain-driven winch, a very old, small version of what you might find as a PTO driven winch on a wrecker, we mounted it on a small peice of 1/2" plate and cut a 3" hole at the back end of the plate, this hole is big enough to take a trailer hitch, clevis, or even chain easily. It is driven with a large chainsaw engine running first through a gearbox which is about a 15:1 reducer. You hook it to something immoveable, and something that just doesn't want to move, set it to half throttle and it does the work. It's not pretty, it's loud, and it weighs about 50 lbs., but it will nearly pull a good-sized tree over before it stalls out and stops pulling.

I've also seen people use small gear-reduced starter motors (like off a small diesel engine) to drive a large boat-trailer type winch, after manually taking up the slack by hand then disengaging the handle and using the starter for a short period, this way you limit the amount of time the motor runs for, thus limiting the current draw.

Best of luck.

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