I have a 4 camera solution from Furrion on our Bighorn and love it. I still need to add the 4th camera over the door. Here is a link to that install video.
https://youtu.be/Zzi68Njnk-A
After I did that video, I was contacted by HaloView to do an install & review of their solution. I like the Haloview, a tiny bit more, as it allows the video stream to be recorded, so you have video proof if someone were to hit your RV.
https://youtu.be/S4RirAZ1xKg
Note...I did not pay for the Haloview, it was sent to me to review. As you will see in the video, I did not remove my Furrion system on our Bighorn, rather I did the Haloview install on a buddies RV. . Yea...great for him!!