With it closed, you cant tell the panel is there and it is less likely to have someone go "I think I'll go home and get my wrench while she is at work".
That's why I installed our 50w solar panel
way up and out of sight, hiding behind the awning
housing. Unless you have a ladder or other higher vantage point, you just can't see it's there. From the back even the frame mounts conform to the trailer roof and are painted to match the trailer. Like yours, it's designed to be invisible.