Panhard rods are commonly used in the front and rear coil spring applications because they are needed, but I've also seen them used in front leaf spring applications, such as the Ford Superduty, and I think leaf spring Jeeps and I even recently read a magazine article, where a kit was sold to install one on a lifted Suzuki Samurai. However, I've never ever seen one installed on the front of a lifted leaf sprung Toyota. Seems like it would be a great way to stabilize the front end, at least laterially, without sacraficing any travel. How much difference would it make, and how come no body has ever installed one? At least that I know of.