I have 16 ft walls in my shop and a 2 post lift, plenty of clearance. My nephew has a 4 post lift and the wheel kit so it is movable. will you have enough garage door clearance so you could roll it outside to get a car all the way up? A neighbor had a concrete pad along side his house garage , it looked strange to see a car up in the air next to his garage behind a 6 ft gate. With low ceiling height a set of higher ramps like you see at a used car lot mightr be more practical.