Hauling a motorcycle between rear bumper and trailer

I have done this for over 10 years. Formerly with a 30 foot class A, and now a 28 foot class C, I have a motorcycle carrier in the hitch receiver, and I towed a 14 foot boat and trailer, or a 16 foot hovercraft on a trailer. Now I have a bass boat so I am beefing up the motorcycle carrier. Instead of square tubing for the back bone of the carrier, I am going with a 24 inch hitch extension. FYI, the motorcycle is a Honda Big Ruckus, and the boat is a Tracker 17ft. aluminum modified vee.