This place lists hitches for the crossfire:

http://www.autoanything.com

And this place lists trailers

http://www.bushtec.com

Any trailer hitch assy will interfere with either the exhaust or ground clearance or both, not to mention the aerodynamics. I am thinking of getting a trailer for the crossire, that is one to put the crossfire on, so I can drive my van to events, and tow the crossfire.