Observations from recent searches

I don't know that a house superstructure engineered for occasional vacation use and bolted onto a steel frame to be towed on the highway ever won any innovative product awards. It is very much the nature-of-the-beast that they tend to leak or come apart.
A great deal of durability can be had by maintaining that flimsy structure. Painting the undercarraige or being vigilant about roof leaks are just two things that add considerable longevity. Of course, there is always the user that trades in as soon as a drawer handle loosens.