I have a 2019 Chevy Silverado 1500 and running into the same issue. I think that the computer that is handling the trailer package is sending 5 volts rather than 12 volts when in auto mode. I'll try the trick of putting the lights in manual mode.
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2020 Rockwood Ultra Lite 2707WS
2020 Chevrolet Silverado 2500HD Crew Cab LTZ Texas Edition Duramax
2019 Chevrolet Silverado 1500 Crew Cab with MAX Towing and Texan pkgs.
2019 Mid Year Rockwood Mini Lite 2511S
2016 Rockwood High Wall HW276 (2016 - 2018)
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