For brake lights I used the Mopar Tow Vehicle Wiring Harness - 82211156AB, for 2007-2014 Wranglers. Found it on amazon. It’s plug and play made by Mopar for this reason. It makes the brake lights illuminate on the Jeep when the RV brake pedal is pressed. No splicing of wires required, but is a pain to get to the plugs behind the glove box.
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