I'm building a new garage and want to put a lift in. What do you guys like - a 2 post or a 4 post? The 4 post is movable but the 2 post seems to make it easier to work on a car. I want to use it for working under the car but also want to be able to store a car over another car for potentially a longer period of time. Love to hear your thoughts - The garage is going to be 30'x50' with three large bays and a work area in the balance. Thanks