2013 Audi Q5 Trailer Wiring | etrailer Fastest shipping available and a lowest price 2013 Audi Q5 trailer wiring guarantee. Expert lifetime technical support on all purchases. Complete 2013 Audi Q5 Trailer Wiring installation instructions and customer reviews. Call 800-298-8924 to place your order or order online at etrailer. 2013 Audi Q5 Hitch Wiring | Harnesses, Adapters, Connectors Audi Q5 2013, Towing Wiring Harness by CURT®. This provides all you need to connect a trailer to the tow vehicle. Generous length allows plenty of wire. Female end is for tow vehicle, male end for trailer.