I can't post a picture at the moment.
I've hauled 2 campers on my F-350 cab & chassis (straight frame rails back of cab 34" apart) with an aluminum flat bed. The Cirrus 820 required a 36" extension from my 20,000lbs 2-12" x 2-1/2" Curt receiver. I had an engineer develop a spec for a fabricated extension made with 2-1/2" x 2-1/2" by .250" tubing sleeved inside with 2" x 2" x .250" tubing, leaving the hitch end unsleeved to form the receiver. Sway chains and turnbuckles extend back to the ends of the receiver on the truck. It works well.
I ordered a 7way to 2 x 7way "Y" adapter - one for the camper one for extension cord to trailer.
I tow about a 500lbs tongue weight 4500lbs gross enclosed trailer on this extension.
I like how the extension reduces the off tracking of the trailer to the inside of a turn. It follows much more closely to the truck tracks in sharp turns.