Trailer Towing Ball Safety

This trailer safety tip related to a situation that occurred last summer. I was contacted at home on a Saturday evening by a person requiring trailer coupler parts. It turned out the gentleman had lost his holiday trailer on the highway when the trailer became uncoupled from the ball. I met him at the shop and we repaired his mangled coupler. The cause of his problem was discovered as we were hitching his trailer to the car. I noticed that his ball was extremely worn and as a result the coupler was able to pop out. He was interested to know that it is required that the hitch ball be lubricated with grease at regular intervals to avoid metal on metal wear to the ball and avoiding a potentially hazardous situation.