I need to purchase a Trailer brake controller for my 22 Sierra Elevation. The problem I have is that I want to get the one that attaches to the back of the 8 pin connector but I already have an LED Light Bar plugged in. Has anyone put a second wiring harness in the back of the 8 pin connector and everything work properly?

Trailer brake: https://accessories.gmc.com/product/echo®-in-line-trailer-brake-controller-with-override-button-by-curt™-associated-accessories-19435165?bac=317900&body=4 - Door Crew Cab Pickup&bodyId=53&drive=RWD&driveId=7&engine=2.7L L4 GAS&engineId=17697&evar25=gmc_global-nav&model=Sierra 1500&modelId=548&searchTerm=Trailer brake&trim=Elevation&vin_enc=9y3jilJSoV4rGpefg8e7ZRF/5+LuwyY+EKgctq+ludgnCPADbGUTwFXu61bvDz8=&wheel=147.4&wheelId=651&year=2022

LED lights I have installed: OPT7 60" Redline Parlux Standard LED Tailgate Light Bar w/Red Turn Signal, IP67 Weatherproof Rigid Aluminum Frame Light Strip for Trucks - No-Drill Install - Full Functions Reverse Brake Running https://a.co/d/0bW7hVTR

Wiring harness using for LEDs: CURT 55384 Replacement Vehicle-Side Custom USCAR 4-Pin Trailer Wiring Harness, Black, 6 x 3 x 9 inches https://a.co/d/06NjVthn