How far back/away should the rear view camera "see"? 25'? 50'? 100'? What? I am trying to set our camera up with an appropriate viewing angle, but with the current angle of view I can only see back about 25'. The spacer angle would have to be changed in order to increase the viewing distance.<br/><br/>Our main concern is keeping an eye on the toad, but I also realize there are...