E-T.... I looks somewhat like my 2002 ...the result of a water leak. My Winnebago has a ply/matt glass/gel coat exterior. The wood has rotted and 'swelled' ..then, delams from the glass. There's lotsa RV forum postings about it, but the short version: inject a thin epoxy into the area - then create a 'press' on the exterior skin to re-laminate the remnants. Sorry, for the late reply - I just saw this.
Jim