Hannibal I am not out to prove the tech wrong. I understand his opinion on the slop and that is why I have not worried about it for a couple of years. What I see is a bent bolt and pulled threads. I have checked other peoples hitch in the parking lots and noticed they do not have the movement mine does. I agree with him that the movement is not going to shear off the bolts allowing my trailer total freedom on the highway but, I really don't think adding more movement to the hitch assembly is good. I am planning on doing what you did and stop the rattle and hopefully reduce the overall movement.
My purpose for the message initially is to determine if the movement in mine is the same as everyone else's or is mine different. It seems you had movement and put in a shim and stopped it. That will be my goal as well.