Storing it when not in use would be a issue.
If four wheel loading needs to be a option why not just build a lift platform?
1000 lb. chain hoist and pin it to the ceiling above the lift if indoors.That would be my biggest question, and then if you build one, where ya goin to put it again?
if you're thinking of using that setup to work under the car, I can't think of a worse work height.
Billy Barty or Tattoo from Fantasy Island might disagree.