I think we are a lot more blind than we think we are. Grant it, the seating position in a motorhome is high up in the air, but it still doesn't take much to block one's view. Driving home from work today, I made an observation. I was in a car, following an SUV. At 45 mph, I counted the 2 second rule. In reality, it was about 2.5 seconds. From the driver's position, I could only see about 400 feet ahead of me for anything on the side of the road. I could not see the vehicle in front of the SUV, but I knew he was there because of the shadow. It really doesn't take much to hide what is in your lane, or what is next to you. A moderate size truck will block your view and that is all it takes.