The added length proved to be a bit ambitious for the 2x2 sq tube and a repair was needed.
After some brainstorming we added a flat strap and a small post to the front frame member. If you look closely you can see them in this picture...

as the coupler accepts more weight the tendency to lift is controlled by the forward strap and transfers the lift to the frame front member and tensions the rear strap for assistance. It has essentially made a truss out of the straight tube tongue.