Check trailer wiring message 2014 Silverado

My 2017 Silverado is doing the same thing. It is very random. I can go for an hour and it won't give me the warning, then it will do it 2 or 3 times the next hour. I have done some Google searches and all seem to lead me to replacing the plug on the camper with the GM recommended plug. My 2015 Sportsman TT did not cause this problem with my truck, but, my new Passport TT has caused this warning since the day I got it. I had the trailer checked out and they found no shorts in brakes or anywhere. Leads me to believe that I should indeed change the trailer plug. I am going to do that soon, because the warning gets annoying on longer trips!