For my 2019 Christmas present, my wife and son went together and purchased me the Furrion side cameras. VERY shortly there after I installed them and been using them ever since. They work just fine now , once I understand some of their limitations and clean the pre-conceived cob-webs out of my mind.
Note: My HC 375FL came pre-wired for the Furrion system. (rear of trailer). I installed the 7 inch (the larger one) myself and had no issues at all. It is wired in so when the truck head lights are on, the camera is activated. Now fast forward to Christmas 2019.
Here's some of the problems I encountered and how I dealt with them.
First, the installation itself. To my lack of understanding, the new side camera are larger than the original amber colored side markers already installed on the trailer. Now matter what I did, it would require drilling new screw holes to mount.
I did go out to YouTube video and studied everything out before mounting and I'm glad I did. Had the side camera been placed directly as a replacement for the original side markers, the storage (pass through) basement door hinges would have interfered with the view of the camera.
To test this out, I did wire one in and taped it in place of the original side marker and sure enough, the storage door blocked too much of the view. I came up with a new plan. I left the original lights where they were and I positioned the new side cameras where there was nothing blocking their view. And this work just fine. I am glad I took the extra steps to make this happen.
I ended up mounting them directly above the original front marker lights, about 18 inch higher. So yes, I now have 2 front orange marker lights on the front of each side. But the camera has no obstructions.
Drilling new screw holes was no problem, and i just spliced into the existing wires that ran to the original marker lights. It worked out great.
The Furrion system is OK, if you realize not all cameras will stay turned on all the time. When you press the screen, all 3 cameras will display (left, right, rear), but it will only display for about 30 seconds and then the two side cameras will shut off. In this I was very disappointed. And Furrion designed it ths way. I've read other forums on other web sites and this is the biggest complaint about the Furrion side cameras. Now, you can turn on one side camera and leave it on. When activating all 3 at once, they stay up, but after about 30 seconds, the monitor will flip back to just the one view.
When does the side camera REALLY come in handy? When backing into a campsite, much more than on the road.
Would I get them again? Probably not, unless Furrion changes them so they stay active all the time.
Do they come in handy on the road? Yes, when turning corners, it helps see where the tail end of the trailer is actually swinging, especially on tight turns (when I remember to turn them on).
Hope this helps.