Rear visibility seems somewhat” lacking”…..
It's the 21st century - probably a camera. Would actually save them money as they wouldn't need the switches etc when using it only as a BU camera. Hooked to the lane monitor steering wheel shaker it could alert you to cars in your blind spot if you tried to change lanes in front of them.
Might as well make better use of the .gov mandated camera - requires all vehicles weighing less than 10,000 pounds, including buses and trucks, that are manufactured on May 1, 2018, to come equipped with rear visibility technology that expands the driver's field of view behind the vehicle.