Correlation between weight and "quality" build

Aircraft are incredibly strong and lightwieght. But they are not cheap.

This question was answered when the first Airstream was made. And it continues to this day to be one of the highest quality (and highest priced of all trailers).

When other manufacturers got into the "lightwieght" market corners had to be cut to keep costs the same or less. (Although as the price for wood continues to rise you will see more and more trailer mfg's switching to aluminum.)