sun glasses for rear view camera

I installed a rear view camera on the front wall of the bed of my truck so I could see the height of the king pin in relation to the 5th wheel hitch. It seemed like a good idea until I turned it on and tried to use it. It was so bright behind the hitch that I could not see top of the hitch. I even considered putting a light in the bed under the cover so I could see the hitch.
My wife always watches for the king pin to be the right height but has a perception problem. The pin always turns out to be too high or too low. I thought I could just use my remote to raise and lower the camper until it was the right height while I was in the drivers seat......