especially when the center mirror is blocked by a load. set my motorhome that way with a bumper cam powered by an up fitter switch fed into the Nav, turned on as needed. works great. The hand off from cam to side mirrors is perfect.There should be a way like a button to activate the rear camera whenever you want. There must be some fed restriction like they think it is a distraction. I think it would be better to glance at a remote camera view than looking through the mirrors sometimes.