Here is some possibly useful information. Since the previous owner took the rails, look underneath the bed and ensure the mounting brackets are still there. Fifth wheel hitches don't mount to the bed, they mount to the frame through the bed. If the brackets aren't there, you get to start from scratch. Your choice.
If you plan on using your turning point hitch as designed; don't consider the Andersen hitches or the PullRite ball type hitches. They won't work.
If you plan on using your Turning Point hitch as designed; Don't use a B&W Companion turnover ball mounted hitch. The manufactured says not to. As a matter, I wouldn't use any single point attachment hitch with the Turning Point pin box system unless it was locked out.
If you do have the brackets beneath, I would order some industry standard rails in a heartbeat and do the simple installation. The finest fifth wheel hitches made are designed to fit in the rails and perform exceedingly well. They aren't obsolete technology, just the opposite.
