5th wheel receiver hitch latch not completly closing

[luggage]

I moved my 5t wheel camper at my home today because I noticed the Wheel Masters level on the King pin tongue was a bubble and a half off to the left. We've had a lot of rain and the gravel drive is not completely level. Well I hooked it up and the coupler on the hitch closed. But apparently not completely because the handle that opens and closed the receiver latch is completely returning to the closed position and not matching up with the hole on the hitch to place the locking pin through it. I am very new to fivers coming from a TAG and still getting use to the hitching and unhitching. What should I do to get the locking coupler to completely close so the handle will seat properly. I hope I have explained the issue clearly. Apologies if I sound clumsy. Thanks

[Sturgeon-Phish]

What type of hitch? Most of the time if the hitch does not latch it is due to the jaws not being complety engaged or in a bind.
If you are connecting up, I'd reverse what you've done, pull away and start over. You may be high hitched or off side to side.
When you connect, are you following the manufacturer's instructions? Most have you starting off with the jaws open and the kingpin about an inch below the platform?
Jim

[Nutinelse2do]

Could be as simple as it is gummed up, time for some spray graphite, and a little elbow grease. It maybe mechanical issue but always start with the basics first.