In the SIMA training video they stress looking out the back window of the truck when you are backing. Personally, I think that is BS. In my opinion you may see better immediately behind you that way but you have lost the ability to track your plow corners and have no peripheral vision to help see what's coming at you from the side. In addition, I think the fatigue would be much greater from all the twisting and turning to look out the rear. Who does what here?