Ok, i will just say how i do it. I hook it to the hitch. Not the ball. In the scheme of worst case scenarios, the ball will fail first, or i the locking mechanism will fail. Odds are the whole hitch assembly thats bolted on coming off are slimmer. I hook mine up to where the saftey chains go, i make sure the wire is less distance then the chains. So if i come off the hitch it will enguage and the chains will still be on. I will be able to feel the breaks on the trailor pulling back and i can stop. This way seems safest to me.
