I have a 2020 1 ton denali. Pulled same trailer since purchasing with no problems. Left for Missouri with same trailer and I believe brakes applied very quickly on their own and then let of. Almost locked up. It happened about 6 times. I did everything to isolate the trailer to make sure it was not the problem. It still occured. Did not matter if cruse control was on or not. It would be 100’s of miles between occurrences. I am now seeing if being not in trailer mode makes a difference. I am heading to Branson Missouri and will drop off at dealer. The stops were so sudden and unpredictable. Everything in trailer was all over. Lucky we did not cause an accident. Anyone else have anything to add?
