I second O_D about leaving the car in neutral. I've been told that the constant fore & aft lurching of the car while underway can put unwanted strain on the driveline. I use 4 heavy duty ratchet straps attached to the front and rear axle points so the suspension of the car is free to move (as designed).
Also, HF has some adequate and reasonable priced winches that would do the job for occasional use:
http://www.harborfreight.com/catalogsearch/result?q=winch I have both an open flatbed and an enclosed trailer with Ramsey winches, but at today's prices I'd probably look at less expensive brands as they don't get used that often. I think you will find that a separate dedicated battery is required to operate the winch rather than trailer wiring.
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