I used the double slot hangers rather than the single, which keeps some of the movement down on the hangers. When I did my first test run of the trailer, due to the light weight on the hangers, some of them did manage to bounce up and out of their slots in the rear of the trailer. To keep the options of moving the hangers around, left the hangers in, but did drill some small holes just above the hanger on the wall support and put small cotter pins in. Now there is no way the hanger will bounce up and out unless the cotter pins are removed first.