Chuck offers a good suggestion. Another suggestion depending upon your garage/shop would be to simply hang a chain hoist from the ceiling. If you have a wood frame ceiling you can go across above the joists with a four by four, cut a neat hole through the ceiling (trim out nice if you like) and suspend a chain hoist from the four by four.

I have a beam down the center of my shop with rollers that allow me to move the trolley on the beam. My chain hoist suspends from that. You can get a half ton chain hoist for $50 or so and it has no hydraulic sag.

Good luck,