Lots of discussion on the subject with some not being able to solve the problem. I was wondering, for those who could not solve it, if the problem could also be caused from the axle wrapping and unwr...
In my experience, porpoising, up and down movement, is usually caused by too light a pin or hitch. You can have it with both bumper pulls, FWs and GNs, and I've experienced it with all 3.