Another Calgarian chiming in. Something in the water, perhaps.
I bought a curt rv hitch:
and plan on attaching it to the back of our new 2010 FDS. The frame rails on the trailer are 6" tall I-beams and run right to the back of the cross plate where the jacks attach. I have modified the mounts on the hitch to slide inside the i-beams and then bolt up. There are already mounts there for the "factory" hitch that you can buy from FF. ($270Cdn + shipping from funfinder, when I inquired). I plan to bypass the mounts and bolt directly to the I-beams. Simply cutting a slot in the rear cross plate will allow direct access to the main frame I-beams.
Just to re-iterate, the frame is made to accept the receiver hitch from FF for their Bike Rack option. It is not too weak.