On www.myrvtalk.com there is a heading called Hitches and Sean Woodruff, one of the founders of the new company, is the webmaster. There is an ongoing discussion of the subject and direct access to Sean who was a former senior member of Hensley/Arrow and is now one of the partners in the new company. Can't get better than that.
Good luck, safe towing and happy camping!
02 F250 7.3 Auto CC LB Brakesmart Reese Straightline
98 Sunnybrook 29DBS
Yes, the patent on the HA is expired. Jim Hensley is trying to correct some of the shortcomings or annoyances in the HA...the new one has an adjustable height hitch head to eliminate drawbar swapping, better strut design, etc.