aluminum frames

I dont know about your model but my son has a 2003 Dutchmen bunk FW and the whole back wall is about 2 inch thick foam with an aluminum frame around it. I believe there is plywood and filon on the outside and about 1/16 inch plywood bonded on the inside. We noticed the moisture lines on the sides during the morning and it appears that some of the windows have no aluminum frames around them. That's how they stretch it to 35 feet and still weigh in at 9000 lb I guess. I told him drive slow, slow down for rough spots when ever possible and be gentle.

You would have to ask Sierra. Our Komfort has "alumacage" all round up and down, Some "fake" Komforts that came out later like Trailblazer had the aluminum all round but had wooden roof struts instead of aluminum like a "real" Komfort. So it could be complicated and you would need a company rep to confirm I think.