The Andersen ball/coupler attach is very rigid/secure and no it does nothing to absorb movement which is why I am a little perplexed by their somewhat lame response...
I would be willing to bet a paycheck the MorRyde would make a noticeable improvement on my setup.
Someone out there has to be running this pinbox with Andersen and can give us "real world" results. I can't see why there would be any compatibility issue running this pinbox with the Andersen. The angle of the coupler never changes vs a static pinbox. The only difference the hitch would see is less extreme forces exerted on it by the trailer. How could that be a bad thing?