Just a heads up. Traveling down the highway last week towing a Nissan Frontier with a Roadmaster Falcon 2 towbar. Checked rear camera and something seemed amiss. Stopped checked come to find out one lock securing the towbar to the toad had broken, and one side of the towbar pulled out of the pulled out of the receiver; lodging against the bumper. Locks were the American locks provided with the towbar approx 8 years ago. Needless to say replaced both locks. No sign of wear on remaining lock. Fortunately good Lord watching over us, and nothing drastic occurred.
Guess just got fatigued and broke. Something to be aware of, and replace periodically.