Paul,
Thanks again for your patience with me getting hung up on that hitch mount and for taking the time to inform me about the Rakattach. I ordered mine and it's due to arrive by Wednesday.
I've spent years looking for the right solution and your post was a cut-to-the-chase. The only other option was MWE, but they seem to have either gone "belly up" or completely lost interest in building swinging hitches specifically for tray-style bike racks.
I'm not sure how you came across Rakattach. Their presence is pretty low key, as far as I can tell. I suggested to Walter that he get on this forum, as well as Expedition-portal, and shout out.
Thanks again!