SOLVED, Finally!! 3 pairs of different Reverse lights, same issue across the board. For my 19 Silverado Trail Boss, it seemed to be primarily related to the Right Rear as through all the troubleshooting when I put the original stock bulb back in the problem went away. Anyhooo this is the fix: https://www.amazon.com/gp/product/B07HF47RV9/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
iBrightstar 50W 6ohm Load Resistors - Fix LED Bulb Fast Hyper Flash Turn Signal Blink Error Code $7 Bucks.
I clipped the green wire, put one of these inline and Voila. That being said I went all the way back to my Lumenex bulbs since they were by far the brightest ones I have used. What a dang headache I am so happy to be done screwing around with something so trivial!!