Alden, our 2012 had the brake feed spliced into the wiring of the brake light as part of the wiring to the trailer plug.
When I did our 2015 I found a plug in the factory wiring, LH rear (above the torch) where the trailer harness is connected. I simply plugged in and brought the wire forward to the controller.
Both have worked perfectly with no issues with Incandescent or LED trailer lights.
It is possible your 2018 retains a similar plug.
I have a P3 in the little cubby in front of the console.
John
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2015 Laredo CRD with QL - that replaced our 2012 Laredo CRD Bright Silver with QL
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