Here's another idea for mounting & running your wires. As I didn't want to drill holes in my rear wall, I mounted my camera to a piece of 3/4 × 1-1/2 aluminum channel and attached it to my to the ladder with stainless steel u-bolts. I then ran 3/4" PVC conduit under the trailer through the open tubing that the springs mount on for the entire length of the trailer. A wide 90 degree coupling then up the ladder. I pulled my wire before gluing that coupling to make it easier.