I kind of understand what you are trying to say, but I certainly wouldn't go as far as say trailer manufacturers have engineers designing their trailers. I find that all most laughable. Have you actually seen any trailer manufacturer places? I have. Not as "engineered" as you would think. They are building for profit and not strength. And people that buy used trailers and up upgrade them are no more at any issue then buying a trailer new. Since trailers, even home built trailers, have to be certified via state patrol or the like to be declared street worthy, I see no integrity or responsibility issues then any new trailers. Insurance companies, if home built trailers were real problems, would either not sell you insurance OR have a person view the trailer and certify it. I actually have such a "home built trailer" and did have a state patrol inspect it. And I would certainly put it up against any new trailer, of the same class, any day of the week. JMHO
