I am sure Matt has found his solution already but, I did this on a 35' Bluebird Wanderlodge using a 500lb capacity motorcycle carrier. I originally planned to bring my Triumph Explorer along, but quickly realized that it would exceed the loading capacity of the motorcycle carrier.
What the manufacturers of these devices do not tell you is you need to consider the load placed on the carrier and the hitch mount while moving down the road. A 450 lb motorcycle, as the RV travels down the road through dips in the road surface can increase in weight dramatically so that I could see the actually down force on that carrier making that 450lb motorcycle more like 650 lbs. In the end, since I had already purchased the carrier, I bought a small 150cc scooter for transportation.

My determination on these motorcycle hitch carriers was, they are only safe for very lightweight motorcycles. Small dirt bikes, enduros or scooters. If you want to carry a Harley or other large bike, check out Overbuilt Lifts out of NY. They are pricey, but with their motorcycle lift, you can carrier your motorcycle and tow your toad or trailer.