Historically there was a utility box mounted in the A frame. I that is what you are referring to and that lid is hitting the banana strip you may have body separation of the trailer skin coming free of the c channel. If it is seperating on the outer skin it is likely separating on the inner skin. You should be able to get to the inner skin by lifting the coach or removing any cabinets that may be across the front of the trailer. If the rivets have failed it will be clear.
The picture is what I found when I removed the banana strip
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles