I've been using a locking pin sold under the Valley name for over 20 years. It's important to make sure the lock assy is fully seated in the end of the pin. I pull key out and push on, making sure I hear the locking "snap" and than check to make sure it's secure. A little WD-40 from time to time keeps it all working.
I know that with locks I've sometimes been in a hurry and found that padlocks have just snapped back open unless I close them firmly. Most, if not all, locking hitch pins work similar to padlocks so I double check.
"A wise man can change his mind. A fool never will."
"You only grow old when you run out of new things to do"
2018 Flagstaff Micro Lite 25BDS
2004 Nissan Titan