If you find or know of RV-related forums or bulletin boards (both electronic and cork) or similar places where you can advertise and other RVing people congregate, that would be a good place to start. This forum is not the place to sell stuff, of course. Some here probably think you've already gone too far towards advertising merely by asking the question.
To the average non-RVing buyer, the tow setup is of no particular value and may well be a detractor rather than an attractive feature since it generally means additional wear and tear that is not accounted for in the odometer mileage. I of course would not suggest or try to mislead anyone about the condition and history, but it's not something that I'd highlight if selling to the broader public either.