When I was not having success unhooking the camper from the truck the camper and truck was on a down hill incline. This morning I moved the unit to the driveway where it is level. Raised the pin box just high enough that I could tell it was not touching the hitch plate, put the truck in neutral and let it roll away from the camper and settle, put the truck in park walked back and pull the lever to release the pin from the hitch and it unlocked and released the pin. So I guess I will always have to find a campsite that is level and straight to be able to unhook and hook back up.
Anyway the truck is free from the camper so I can now look forward to the next episode. Thanks for all the help.