I'm the type that orders all the towing options whenever I order because I tow a 41ft. 5th Wheel and need all the visual info I can get. So initially, I ordered the XN1 Trailer Surround Cameras because it had to be factory-installed and sounded like it might be useful.
Then I thought more about the difficulty of hard-wiring the four cameras onto my trailer - which has rigid foam backed fiberglass sidewalls, full-body paint extending onto the roof, and Alpha-ply membrane roof that I hate to drill holes into. When I read the description and saw the pictures, I decided that the visual benefit was just not worth the installation effort if you have a 5th Wheel with an interior you just don't want to compromise. Also, I remember how cludgy the implementation of the Truck Surround is on my '20… selecting camera, shifting to Drive to pull forward, shifting to reverse, re-selecting the camera, shifting back to Drive, re-selecting the camera, etc, etc.
I would say that the main benefit of XN1 would be to longer utility and race-car type trailers (trailers that have ability to access wiring inside the trailer.
Before I had my dealer place the order, I canceled the XN1 Trailer Surround and instead ordered the XH7 Tow Mode Camera (which stays on the digital mirror while traveling). That sounds perfect for my needs and only requires fishing the camera wire up the rear cap (still very difficult).