They are made of aluminum, the overall thickness is like the wall thickness by the door, or by the access hatches.
Some of the hatches actually go right by a rib, so you can see part of it.Also, look behind the refrigerator. There might be exposed rippage there.
I am not sure how wide they are, but if you look at whenshall's pictures, then you might see one of the ribs exposed. Or write to Andy at Inlandrv.com , they know for sure.
Kinda neat, it's like detective work.
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