I want to install a camera in the horse area so that I can see what's going on with the horses while I am driving. I bought a camera and it will connect to a small tv that I have.  I have 80 - 85 feet of cable that goes between the tv and the camera.

My question is where to put the camera in a three horse slant.

Thanks.

I would guess the upper right front corner.  That depends on the lens and if your dividers are solid or not.  You could try the back right corner also and see how that looks.

I really want to install one in our rig but have not bought one yet. 

Thanks.  I was wondering about the back right (tail) corner, or the front left (head) corner.  My dividers are currently solid, which I didn't think of.  That is a good point. Perhaps, I'll try it more midway but from the tail side. 

I bought this camera at Harbor Freight for 31.00.  Perhaps I should have looked around more, but thought something wireless might not work well through the trailer walls.  It comes with lights and says it's a color camera with night vision and microphone, weather proof and easy to install.  I guess I'll see.  It seems simple but if there is an error to make, I'll find it:).

I tried it a few places and so far it seems that the passenger side rear is best.  It seems to work well for now with good sound and good enough picture (300 Mpx).  It came with an 80 foot cable so that's worth a part of the $31 cost if it does break down.  The night vision part works for me in absolute pitch dark, though that was a complaint in the reviews. Of course, it isn't in color on night vision. 

So, figuring out how to get the wiring out of the trailer to the truck is another issue.  I know how to run the wire while it is inside the trailer, but then I have to get it out an have it go inside the truck where the tv will be. 

Oh, the owner's manuel says that it is 0 lux up to 15 feet.

It won't be more of a distraction than the rear view mirrors.  It's not like it's entertaining to watch horses stand in their stall.  The bigger risk is that I would not pay sufficient attention to the monitor. 

The reason for it is that I worry about what is going on inside the trailer when I am hauling.  My friends fantastic mule fell in his trailer and he didn't know it for a long time.  She is a very smart, experienced mule and he is a very smart, experienced horseman.  I want to know if something like that happens.  Many bumper pull trailers are designed so that you can see through to the horses.  My gn is not.

In testing locations and dark, I've learned some things.  It works great in pitch dark. It is very easy to install and use (though I'm still not sure where to have it exit the trailer on front to go into the truck.)  It is focused properly for the distances.  It's a security camera so its angle is wide from top to bottom and not very wide from side to side.  From the back corner, I get two stalls completely and very clearly, but I then have to put the monitor sideways.  I'll play around more with the positioning.  Yesterday, I got the three stalls, so I may go back to that position. 

Before I permanently mount it, I think I'll try it on the back to see how I like that and perhaps get another one for the back.  My trailer is only 18 feet though, so not at big as  yours. 

Thanks everyone.