Arctic Fox is an atypical build. They build a framed trailer and skin it with a fiber reinforced composite sheeting. Most fiberglass trailers with flat walls are a box assembled from laminated foam-core walls, rather than being framed. Fiberglass trailers with all corners rounded are usually molded shell, like the hull of a fiberglass boat.
Thus what it looks like only sometimes tells you how it was built, and for the most common building methods, whether framed or laminated panels, there are big differences in quality from manufacturer to manufacturer. A lot depends on how the box gets assembled and what it sits on.
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For tops in structural integrity, look at the Canadian-built Bigfoot 2500 line, which is molded shell and goes up to medium sizes. Most TTs built this way are tiny, all are expensive for their size, because they are expensive to build, compared to laminating two or three flat wall panels, screwing them to a floor and roof at the edges, and fabricating a cap or lightly framed cover for remaining openings.
Visit some RV factories if you are concerned about structure. Don't, if you are concerned about lowest price, because seeing those built can be disturbing (at least to an engineer).
That is some explanation Tom, thanks.
Mike
