When BAMF first released our HDH (Heavy Duty Hanger), we intended on making a crossmember to link the two. We don't like to do things just fast and easy, so we won't just slap a tube straight across them and call it a day. We intend for ours to be better than that. Time got away and the interest in them is not extremely high, so it's a winter/weekend project for now. Currently, this is our cheaper alternative. These laser cut plates, will be used for our crossmembers and are now stocked for $30 shipped with the hardware included.
Simply bolt the plates to the hangers. Cut yourself a piece of tubing from 1.5" x .134 wall to 1.75" x .120", weld it between the plates and you are locked.