Are the cars you're stacking 2' tall? Seems like if the car was at a minimum 5' tall you would only be able to lift it at most 4' off the ground. I'd have to think the lift its-self is going to be about 6"-8" tall on the frame. Maybe I'm overthinking it???
There are several mfg 's in Mansfield area. Gemini comes to mind .I bought my first from a Cali. co and low and behold it was made in Mansfield ,! Check you may be able to buy factory direct or at least pick it up yourself and save some money?