Thanks Durb, very interesting. One thing that bothers me about the chucking I am experiencing is the frequency of the push-pulling force appears much higher than the rotating mass of a trailer could achieve. It also occurs frequently on very smooth newly paved road surfaces. Severe road imperfections or road expansion joints appear to be handled well and well controlled with my Andersen hitch and shocks on the trailer. Also I am surprised that my Mor/Ryde rubber pin box isn't eliminating or reducing the forces more. Perhaps it is really an up/down force that is occurring but the "feeling" on occupants is a push-pull. I am leaning toward the cause being more a situation of the truck spring rates fighting the trailer spring rates. I am working on having someone else tow my trailer to see if there is a difference.
