Thanks. There's a lot of photos at https://locknroll.com/gallery/gallery-category/ including cross section view of the bearing and an animation demonstrating the articulation.
I work at Great Lakes Forge, makers of Lock N Roll. The hitches new design has zero binding issues and also many other improvements, which is why so many are going back to Lock N Roll. It used to be that Lock N Roll was more of a side project in our forging shop but Lock N Roll has become the...