Funny this topic should come up. I just finished installing my TrailAir TriGlide yesterday. I hitched up and started to pull the coach out of its parking spot. Well I just about crapped my pants. For those of you who aren't familiar with the TriGlide, the king pin plate moves slightly back and forth using a cam system. When I started to pull away, I was looking at my camper in the mirror. My truck moved but the trailer didn't. SLAM go the brakes as I thought the camper was about to drop into my bed. It was the king pin plate that moved. Man, did my heart skip a beat.