Could you post the phone number to the dealer with the wiring harness (and the part number too)? In Canada they cannot be purchased separately from the hitch. As for the USA... there are no hitches anywhere in the USA either (I called almost all of them!).

One dealer said they must be getting some hitches in stock because there used to be a backorder of over 800 in the states, but now it is down to 250 or so.