trailer brake squeak

trying to answer all the posts at once so please forgive if i forget something. I have tried to chock the wheels and that works if i can stop any motion whatsoever. The squeak is not the brakes magnetizing because the brakes are not being used. I realize that all the parts are bolted and belong in a certain spot however when the brakes are activated they spread outward so that ability to move is right where the shiny spot is. When i wasn't positive it was the brakes i pulled the breakaway switch for the brakes and no noise. no matter how much i jump around in the trailer. when i put the clip back in the breakaway switch and the brakes are off, instantly the squeak is back. I appreciate all the posts and suggestions.