1994 Aljo 27 5 th wheel trailer wall construction?

The roof is a one piece aluminum  and I've noticed the spring that on the edge of the ceiling the joint molding is wrinkled about 2 inches from edge? I was wondering if the walls studs were aluminum or wood ? I see I might have some water damage around the oven vent? I just trying to educate myself on what kind of repairs am I looking at? 

Thanks, Steve