Fiberglass may be durable enough. Kim and Don Greene, a couple who post here occasionally, had their fiberglass camper shell built by Unicell in Toronto. The Greenes have driven their camper all over North and South America, Australia and much of Europe without problems.
Here's the Greenes' web page that shows pictures of the camper under construction at Unicell. http://www.questconnect.org/exp_veh_construction_1.htm
This is the original body that was on my chassis. It was built for Homeland Security but ended up being too small. They removed the body from the E450 and placed it on a F650 or 750.
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