Here is my take. Most likely, the mirrors are MB brand that are used on Sprinter duel chassis. The normal blind spot exists, because the house portion attached to the chassis, has no windows allowing you to check your right side, when turning (not changing lanes) right. That is the same issue semi-tractor trailer combinations have, AND most have a sticker on the back of the trailer letting other drivers know of the blind spot.
Therefore, unless you install some equipment that makes you feel comfortablein that senario, there is nothing FR, or MB can do, other than more cameras, thus up goes the cost and so on.