Hard to tell in pictures but I think that is a Landoll bed. We had an exact twin to it. Actually, it was the first rollback in our city and forced several other towers to get one. Sold as a kit with bed, frame lengthening section, driveline piece and carrier frame section. One we had was used hard for 10 years. Having a shorter bed limited what it could carry, no Suburbans, crew cabs, ect. "Stinger" as you call it really can't be used for anything weighing more than a VW bug, chassis can't handle it. Additionally attaching anything on back has a LOT more liability.
All that being said, if it was local to me, I would be all over it. Great unit for moving car projects and misc stuff.