Reply to Terryallan.
You see the whole trailer, if you read the original post they are not comfortable backing in even in daylight, most people have a hard time backing even theire own car let alone a trailer, and doing it going to the right is even more complicated for them.
I have guided folks to back in or actually drove the rig for them so many times, there are folks that just simplly can not go in reverse, so if they go on the left side, they can see, normally mirrors on the right have a warning, objects on this mirror are smaller than actual size, hard for people to judge distance.
I am trying to help the gentelman, maybe you can give us some pointers in backing a trailer in pitch black and a strange location, we can all learn something usefull.
navegator