1977 Dodge Full Size Pickup Trailer Hitch | etrailer Lowest Price Trailer Hitch Guarantee. Installation instructions and lifetime expert support on all purchases of 1977 Dodge Full Size Pickup Trailer Hitch. Order online at etrailer or call 800-298-8924. 1977 Dodge DW Pickup Hitch Wiring | Harnesses, Adapters Get your 1977 Dodge DW Pickup outfitted to electrically connect to any trailer. Towing is simplified with our selection of harnesses, adapters, and connectors.