Whilst running the cable for the camera on the back of the van I found 2 orange wires hidden inside the A frame where the trailer wire exits. Are the for the fridge??
Are you talking about the part of the A frame under the van or up closer to the front where the trailer plug is.
I must say when I did my reverse camera it sounds like I took a similar route for the wire as you.
I didn't come across extra wires but I wasn't looking for extra wires either.