My hitch is locked if I pull my rig off the site, period. And another habit I've got into is EVERY time I put the truck in gear and start to roll, I apply the manually apply the trailer brakes to make sure all is well. This happens even after a quick stop at the rest area. I've done this ever since I heard about the guy that young grandson was playing in his truck. When he left he had to quickly go down a long and steep hill. When he apply the brakes there was nothing there (no trailer assist). Seems the boy had turn down the gain all the way down! Scary ride. rockin'