Parking Lifts
I do not remember seeing that combination anywhere, but I will tell you that i have owned a Backyard Buddie lift now for 4 years and I truely love it. I looked andd looked, talked and talked to all of the lift people at shows and in garages before I bought. The BB lifts are a little more expensive but they are extremely more safe than the others we looked at.
look at the way the end frames interface with the posts, The BB lift table end frames totally enclose the vertical posts they slide on, very stiff and solid. The safety notches in the posts are punched into the tubular post wall not blocks welded on, so you are not depending on the skill of a welder to hold your car up.
also from a parking perspective, the power unit has a quick disconnect so you can use a single power unit on multiple lifts and save some money that way if you are "shelving cars" I dont think I would want to depend on a 40 foot long lift table to be stable lifting 2 cars at one time, i also thnk it would take some flexibility out of moving cars around if I had to move the two bottom cars each time I wanted one of the uppers. also a BB buddie lift does not require floor bolts to operate I can move my lift on the wheel kit with a car on the lift. Not that you would necessarily want to do this but it can be done. The other point is I have floor heat in my shop and did not need to drill holes holes in the floor for anchors.
If a lift has open side corner posts and the lift table hangs in that open side on the cable with no means of enclosing the connection to stiffen the corner joints run away, the lift could parralelagram and collapse with the car on it.
http://www.backyardbuddy.com/
follow that link and look atwhat a great lift looks like, and also the pictures of what could happen with a "cheaper" lift.
Big Jim