Reese R16 Noise

I have read several posts about the noise from Reese hitches and am now experiencing it first hand. We are new full timers and will begin our full time adventures in early July. In anticipation of our travels, I replaced my five year old Reese 16K with the Reese R16, thinking I was upgrading to a better quality heavy duty hitch. My old 16K was relatively quiet. The new R16 is not. When I come to a complete stop there is a pop or chunk sound. When I start from a complete stop, there is a pop or chunk sound. I checked all the connector pins and they are properly installed, however, there is considerable slack in the two pins that hold the hitch head to the hitch base.I called Reese tech support and was told that the noise was normal and was not a safety issue, but I might want to consider using spacers to eliminate some of this slack. Of course Reese/Cequent couldn't provide the spacers. Then I just read a post that cautions about the yellow spacers used in the hitch. I bought the hitch through Tweedys. Comments and suggestions as to this situation will be appreciated.