Scion iQ Trailer Wiring | etrailer Guaranteed fit Scion iQ Trailer Wiring. Lowest price guaranteed. Thousands of customer trailer wiring reviews, expert tips and recommendation. Lowest price guaranteed, easy online ordering at etrailer or call 800-298-8924. Scion iQ Hitch Wiring | Harnesses, Adapters, Connectors When you tow with your Scion iQ, you’ll have no problem making the electrical connection to any trailer with our selection of harnesses, adapters and connectors.