OEM LED Tail Lights BCM Signal Wire

[Silver-ado]

Question for the electrical gurus... I’ve installed a flatbed on my 2016 GMC Sierra 1500 SLT. All of the lights on the bed are LED as well. I have no issue wiring the lights to function properly, however, I don’t know what to do with the red BCM signal ground wire. It makes no difference if I tie it into the ground circuit at the light or not I still get hyper flash. I chose to wire into the existing tail light sub harnesses to avoid the hyper flash I expect if I were to wire directly into the trailer plug. How closely would I have to match the load into the BCM to prevent hyper flash? I didn’t expect to have to add resistors as you would in a typical incandescent to LED conversion. LED to LED I didn’t expect to have an issue. Any help would be much appreciated!