Is anyone using a Pakit Rak with a Rivco trailer hitch? (2006 & similar models) The only Rivco hitch I see for a 2006 is a through the fender installation, and it appears that there is no receiver tube to accept the Pakit Rak. I assume there must be some type of adapter that could be used, but I couldn't find it if there is. The Pakit Rak site shows a Rivco hitch adapter, but I don't see how that could work.