Re: Receaver stuck on hitch
The locking mechanism in the tongue hitch may be hanging up, so be sure to lube all that-- My favorite lube for such things is lithium grease in a spray can. Comes out fairly liquid so it gets everywhere, then thickens up afterwards. Spray the hell out of it, then wipe up the excess afterwards...
Another thought- have you recently (or ever?) hit the tongue into the ball or receiver while backing the truck up? Most of us have, and most of the time nothing happens, but with enough force the ball pocket can be tweaked into a slight oval shape that you can't even tell by looking at it, but will still cause an interference fit with the hitch ball. Once you're greased up, ensure the release/lock mechanism is fully retracted, then insert a spare hitch ball- if there's interference, check if the ball is touching the sides of the pocket or the lock parts...