This is on sale at HF ($40) and although it is way too short in length, someone with the time to void warranty and weld a bit more length. If I really wanted this kind of set up and were to mod it and put in a floor or something to cradle the wheels, it would be a job, but the thing as it is has a 500 lbs rating.
There were 4 reviews, one said something about not fitting their hitch, and another said tail pipe put hot exhaust on the stuff. Others gave good review and so well as I say:
Just a thought!