I have been using a 4 inch drop hitch for 3 plus years. Bolted on ball. On our last trip went to pick up my partner, he made a joke about checking my hitch and got in the truck. We know someone that lost there ball while trailering recently and all ended up ok.
I was in the truck and decided I better check b4 we left, and sure enuff the ball was loose. I consider myself lucky.
Always check your hitch ball and make sure its tight, if u have this type of hitch.