Finished the install and it works great. I even managed to get the camera to display on a Motorola Android phone (although the display quality was noticeably inferior to the iPhone 6).
Ran into a minor problem when i removed the FR installed mounting box for the Furion camera. There was a 1.25 inch hole drilled out of the rear facia for the Furion power cable. No idea why it's that big since the cord end is less than ¼ inch diameter. Also, whoever did the install at the factory apparently set it about ¼ inch out of place...which they fixed by resetting it properly. Problem is there are now eight drilled holes. Pretty sloppy work.
The Sharx camera mounting base was not big enough to cover both the large hole and the eight mounting holes. I solved that problem by mounting the camera and the associated waterproof power connection box on a 5x8 inch aluminum plate (painted to match the trailer color). Then, attached the plate where it covers all the holes FR was kind enough to drill out.
I velcro mounted the WiFi router above the bed and about six inches from the front of the trailer. Pulled power from the hot side of the overhead light wiring and installed a SPST mini switch so I could turn the router off when not needed.
Next project(s) is to install another Sharx camera on the forward right side of the trailer so I can see traffic in the blind spot on my right. Then, somehow figure a way to put a mount in the roof of the truck cab so I can place an iPad mini which will swing down in front of the rear view mirror for viewing while towing the trailer.
Pix of the project completion: