Just thinking out loud here...............
I've driven lots of big wheels over the years, including still driving a school bus daily in semi-retirement. These have always had nothing more than standard outside mirrors, albeit different syles over the years.
Our newest RV (2010 330TS) has nice big mirrors,
and it came with the 3 camera system in B&W as a package offerring. Given I never had this additional method for side/rear visibility ever before, I still don't see using it as much as some might insist you will, especially when it comes to deciding to go with colour or not, at whatever cost difference.
First.....the camera monitor is nowhere near the line of sight you typically focus on while driving and checking the outside mirrors.
Second.....it causes you to spend more time looking somewhere OTHER than forward while you're still moving........THAT could be scary.
Third....I don't really think anyone is going to use the side view camera monitor exclusively for checking what's beside the rig............whereas mirrors could be and ARE by a lot of drivers.
Fourth.......changing your focus depth from looking outside, to focusing on a monitor INSIDE the cabin, takes time.......different amount of time for different people.
Fifth......as far as B&W versus colour. Do I really need to see that the vehicle beside me is a coral blue Chevrolet with deep blue accents?
If I do use the cameras and monitor, it's because I feel I need to confirm there is SOMETHING beside me that I BELIEVE I can't or didn't see in my mirrors.
IMO only......your mileage may vary!!!!!!!!