Oh Jeezus Keerist, Wabash and many others have been pounding 48,000# aluminum step decks and drop decks down the Interstate right alongside you for thirty years. Over half of the livestock in the country is hauled in aluminum trailers, which are routinely running overloads because the weight cops give them a lot of latitude on gvw's. Tort lawyers and insurance companies would have put a stop to aluminum heavy hauling if it was an issue.
Down the highway vs. off road. Big difference there. Probably a lot more flex for the toyhauler. I suppose if you used same material for a giant stock trailer to make a 25' rec trailer
you wouldn't have any concerns.
