I'm using a 2 post with 12' cieling. My lift will go to 6'4" and is only limited by the cross over bar on top. So far I've had a variety of coupes, roadsters, trucks and vans on it with no problems at all. Basically if it's under 6' tall from the jacking point (frame) to the roof of the vehicle I can put it up to full height. You can look at my gallery for some more pics if you like. Almost forgot, to get around the whole garage door getting in the way I went with a roll up type. Much happier with it.
Steve