Like everyone else on this thread, I too observe rigs, tow vehicles, lash-ups and things like that. Since I worked in an RV Shop for many years, I am particularly interested in lash-ups. I am very much an advocate for W.D. hitches. I am amazed by two things: Rigs without W.D. Hitches. And even more amazed by a lash-up that has a W.D. Hitch that is not setting level. One of my buddies was telling me that his 29' trailer, hooked to his hefty 1/2 ton(I'm not a fan of that)is not level. Always nose heavy on the trailer. I told him what he needed to measure and adjust and he was stunned how much better his rig towed. Seems that there is a lot of "just bolt it together and go, it's supposed to be right" happening out there.