I just got thinking about this yesterday and this is the first setup I found that looked like it might have possibilities if it were wireless. I see there are some that are wireless backup cameras out there. I think placement needs to be worked out and it would be helpful to have wide angle. I am thinking most of these are wide angle though.
https://www.walmart.com/ip/Pyle-Wate...ll&athena=true
I just found this but the price is way out there for me. The mounting they show for side is on the trailer, hmm that might work with wide angel lens.
https://www.amazon.com/Wireless-Back...ronics&sr=1-24
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Roger and Patty 
TM:2006 2720SL
TV: 2010 Tundra w/ tow pac.
Dealer Options:swing tongue, sink cabinet, awning, air conditioning, tile
Modification: 15“ tires & monitor system, WDH, Prodigy B.C., 2-6 V. batteries & clipper monitor, LED's. Additional modifications can be seen in albums.
Pictures of campsites and places we visited can be seen at https://www.flickr.com/photos/101899116@N06/sets/.
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