Headliner peeling '05
 

The material on the leading edge of my headliner has begun to peel away from a sponge backing.
I don't see any crumbling of dried foam/sponge.
I would expect the rest of the headliner to follow along this route.
Is there "ceiling" of the cab removable as in some vehicles? I've seen thin plywood bases covered with headliner material.
Are Ranger headlines like that? Thanks