Last summer, I put in 4 eyelits, each with a pulley, and all drawn back to one rope and pulley behind where I park my car. This way, you lift the side, slide the 6' 2X4's under and hook them up, then walk to the back where all ropes are tied into one, hoist and tie it off. Then you have a quick-easy off top and its waiting right there for you when you get back. (All equipment and hardware will cost about $30 dollars)
For those of us that have more money or are willing to go 2 weeks without eating, I saw this one day flying across the country. This thing is fantastic, and is built exactly the way I built mine, only with metal parts and a hand crank:
http://www.skymall.com/shopping/detail.htm...69761609&c=
Anyways, hope this helps.