I have a homemade version of the super hitch. I simply showed it to my trailer shop welder, and bought a 2nd receiver from the farm store and he welded it together.
Now I only have a 9 1/2 ft and can use a 14" extension. This spring I plan on welding a 2nd receiver tube together to make the hitch extension.
I tow about 5k, with 2 atvs and a side by side on a 16ft trailer.