I am having problems consistently with backing up the trailer. I move it around the yard so i can mow. I have a Chevy suburban 07 LTZ with tow package. Sometimes it works sometimes not. The round plug to 5 straight pin should work. The dealer did not seem to have issues moving it sound on their chevy's. How do I know if the adapter plug is bad or the mount in the bumper of he truck...?

Also seems like the trailer tongue compresses easy and locks the brakes, thought the electrical signal prevented that.