It will be unstable, but you can stabilize it with ratchet straps. Don't pull them very tight or you risk distorting something. I prefer to hang cabs with 2 spreader bars through the door openings and a spreader bar between the two spreader bars. If it has doors on it, tie the doors about half way open to prevent them from over extending. Hanging them back side up is how I weld patch panels on the lower back corner of the cab.
