Tailgate removal is very simple on a 4th gen... on the edge of the box there is a rectangular plastic cover that the camera wiring runs into... squeeze a tab to remove the cover and unplug the wiring connector. The truck comes with a connector "plug" kit that plugs into the chassis wiring harness and replaces the plastic cover and the kit also has a plug for the tailgate connector to keep the pins from corroding. After that remove the tailgate like any other truck.