...the trailers that I have seen are towed by P/U MDT or HDT:.....I have inspected a lot of towed unites over the years for frame damage.....in my opinion- goose necks/fifth wheels will begin to fracture at the joint of the main frame and the goose neck....or the goose neck and the forward frame....in most cases they will fail from stress-lack of design- along with poor welding practices.....whether the towing vehicle is a P/U-a MDT or a HDT ...there will some flexing because of the light weight materials that are used or there is an issue with the welding.....frame flexing is a great issue and the rv industry manufactures have done the testing by the same method that the mobile home manufactures do....trial and error. Belly broke manufactured homes are on the side of every major interstate and now there are fifths and goose necks in the same spot....I'd suggest one measure and examine the frame at the end of each trip for structural damage and need of repair.....geofkaye
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