JUST ONE MOTOR. Build a solid frame the dimensions of the object. Connect all 4 corners of the frame to a central point and your lifting cable to that central point. Then use whatever you need to raise the single cable.
The crane I built uses 1/16 inch steel cable and is rated at 90 pounds. The motor I used has a worm gear speed reduced and then to chain sprockets and chain to the actual winch drum. The cable is wound on the drum.
Paul