Haul a dirt bike on the receiver hitch?

[GypsyR]

My old gasser did indeed get its frame cut and extended when it was built. But...I've inspected that split and it's like midway in the frame. So if were ever a problem, the coach would be sagging in the middle and I can't imagine whatever I had on the hitch to be a factor. On mine anyway...1993 F53, 38 feet long with a drop axle.

 

[Joe Dutchstar]

To Kevin's point, the forces involved in hanging effectively a pendulum on your hitch may introduce a load that the hitch/frame was not designed to handle.

At the very least, I'd plan to get dirty and scout the frame extension welds, connection area closely, and if you proceed with mounting motorized bikes, on a regular basis.

Not sure how common it is to hang motorbikes off a trailer hitch, found only one story on the Web about a Class C frame extension failure. But that failure could be due to any number of factors, corrosion, other abuse, etc. You might search on the brand of mount you are considering for stories.

Here is a video on point, to give an idea of some frame extension quality. This particular welding on the frame in this Video is downright scary, in my opinion.