Looking For 5th Wheel/Gooseneck Wiring Harness For 2018 GMC Sierra 2500 With 6-1/2' Bed
Updated 05/21/2026 | Published 05/17/2026
Question:
I would like some help to find the correct trailer harness for the bad of my truck 6 1/2 ft 2018 gmc Sierra
asked by: Daniel J
Expert Reply:
Hey Daniel, thanks for reaching out. Yes, we do have a wiring harness that will allow you to add a 7-way to the bed of your 2018 GMC Sierra 2500. For the 6-1/2' bed I recommend the following:
- Mighty Cord 5th Wheel/Gooseneck Wiring Harness w/ 7-Pole Connector - 7' Long # A10-7007
This will tee into the factory 7-way and add an RV 7-way to the bed. Perfect for hooking up a 5th wheel or gooseneck trailer.
What kind of trailer will you be hauling?
(click to enlarge)
Product Page this Question was Asked From
Mighty Cord 5th Wheel/Gooseneck Wiring Harness w/ 7-Pole Connector - 7' Long
- Custom Fit Vehicle Wiring
- 5th Wheel and Gooseneck Wiring
- Vehicle End Connector
- No Tow Package
- 7 Blade
- Plug and Lead
- Plug-In
- Mighty Cord
more information >
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on Custom Fit Vehicle Wiring
Bobby B.
5/20/2026
It was ordered for our fifth wheel and it works great was very pleased ..