Trailer cameras I bought at Goshen. I won't bother with the side view cameras. In my opinion they are not worth the expense or time involved to install.
The rear camera shown here is a 2 camera unit, a wide angle and closeup.
I have the close up aimed to just see my rear bumper on the trailer.
The wide angle is aimed to see the ground about 20-30 feet behind the trailer. There is a dead spot between about 10-30 feet directly behind the trailer.
The hardest part of course is running the cables.
Difficult part #1
I went through the pin box, straight back into the genny compartment. About an hour+
Out towards the door side, back under the bedroom floor into the area behind the basement wall. From there across to the off door side, down through the floor into the underbelly. Along the frame to the rear of the trailer.
Difficult part #2
From the inner frame rail to the most rearward left side corner and up through the floor into the garage, another hour+
I used an old "S-video" cable with the pins removed. Jammed the camera video cables into the now empty end and taped it up. This was for snaking through the compartments and wall.
"If" I was to do this again, I would order an extra video cable, cut it in half and use that for snaking, since the uncut end can be securely attached to your video runs
If you have the pull down screen, just remove, not worth trying to work around.
Don't bother pulling the trim off the forward facing boxed in area. Behind mine was a solid piece of 3/4" cherry.
Pull the trim off the bottom to expose the wire cavity.
Difficult part #3
This hole in the aluminum channel was just big enough for the existing wires, plus my previously installed back up light circuit.
I had to carefully make the hole larger with the wires still in it. Enough cutting to get the new cable ends in.