3rd Brake Light - Chase Light Power???

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I’ve designed and 3D printed a bracket to hold a couple of rock lights to function like chase lights. I am working on building a wiring harness to connect to one of the rear aux switches which are near the hitch. My question is:

What’s the best way to get my wiring out of the cab towards the rear??

thanks in advance, yes I know I’m missing a screw.

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