It’s an old post, but maybe you still need something. Try this: http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=47591
I desperately needed something to take care of my bad back/one man pit crew and this did it. The lift has a 500 lb capacity. You have to modify the deck though. I removed it and replaced it with a crudely built deck of wood and angle iron (the kind with holes in it at Home Depot/Lowes) cuz I had some laying around. Or, you could just extend the stock tubing (originally used for bolting the stock deck on) with some sort of steel and operate it like a fork lift (something I’ll probably try to craft eventually). Modifications would be MUCH more easier with a welder . ..
It wires direct to your battery so you need a 50 amp in-line fuze. I found one at a truck supply place for $35. But shopping around found one for $3.50 at a RV dealer/supply place.
This thing works great. It’s adjustable to place it at the correct height of your tailgate. And, you just flip it up verticle for the drive home.