I have had this ongoing issue with my 2020 Silverado 1500. I have not only had the Dealership check it out at least 3x (with and without the trailer attached), and additionally, took the Trailer to Gen.RV to have it thoroughly checked out 2x. I also had an independent mechanic check it out (no results other than, "take it to the Dealership") and a retired auto electrician who happened to be at the same campground as me and heard my frustration being voiced. Ultimately, this seasoned engineer spent two full days putzing on my truck/trailer combo and tested everything. He was able to print a very thorough GM document (not sure where he found it.. didn't look like just a plain internet search), which demonstrated that GM CLEARLY knows this has been an issue with MANY of their trucks! I have now officially opened a complaint case with GM. I explained to them that THEY know there is a problem and when my electric brakes give out sporadically, leaving no warning, there WILL eventually be an accident and THEY will be held liable. This is very frustrating for MANY of us. Please, open a case with GM so that they do something.. a recall.. anything. This is so dangerous!