Frame mounted motorcycle carrier

[JJF]

I haven't built it yet as it is still in the design stage. I have posted some 3D renderings of the get-up though. Reason being because there is one slight issue with the design (that I can think of of course). Because the carrier is mounted through the reciever hitch there is going to be some wobbling that will occur because the HSS that goes into the receiver hitch is obviously smaller...any ideas how to fix that??