Does the trailer have a blank mount for the camera as part on the prep option. You need to know what camera it is prep'd for. Have you asked the dealer? Our Big Horn came with mount and power to it for the Furrion camera. There are two and slower back up model and the faster observation. This is what I bought.
https://www.amazon.com/Furrion-FOS48TAPK-BL-Wireless-High-Speed-Observation/dp/B010XWNFOM/ref=sr_1_1?ie=UTF8&qid=1491519935&sr=8-1&keywords=furrion+wireless+observation+system The one with the mount included was cheaper than the one that goes in the existing mount, go figure. It is wireless and works well.
Ours was powered from a Sconce Light on the rear wall, so I installed at power switch in the light base for the camera power.
Chris