This is the reply I received after sending an email to Keystone, the material is called Coroplast (Google it). There are several sites that sell it in various colors. The cost is about $24 per sheet (96" X 48" X 4mm), the problem is the shipping cost.
Thank you for taking the time to contact Keystone RV. The manufacturer of that underbelly is Travel Star Products of Goshen, Indiana. Their phone number is: 574-533-0447.
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