Hi folks, not logged in in a while I'm afraid.
I tow a Seadoo behind my trailer, the only time I could see it is when taking a farily sharp corner, so, I got one of these:
http://4ucam.com/Wireless-Backup-Camera-Monitor-AZR-Color-RV-Cam-Truck-Trailer-Rear-View-IR-Night-Vision.html
Talked to my electronics buddy, who said "they're (wireless cams) all about the same, get whichever".
I put the camera up on my ladder, the transmitter under the nose, wired to the parking lights. I can see the 'Doo fine while towing, and it has some usefulness when backing as well, as I can see that I am not about to run over something, such as for example, the DW:)
As the camera is aimed downward I can't see especially far back, but installing it lower would help that. It works reasonably well for what it cost, and for what I use it for.
The vendor was helpful before the sale as well. Yeah, you can get better stuff, but not for this price:)
Can't imagine not having it now. And as a bonus, when the trailer is not hooked up, I can sometimes get a signal from the Taco Bell drive-thru:)