Just to add my experience to the mix. I have had problems caused by the jarring stiffness of the HDT suspension, on lighter weight trailers, far faster than I have had trouble caused by the softer stiffness of a LDT pickup suspension. As mentioned here trailers are not particularly well built, and will fail at specific points, but. . . the stiffness of the suspension of the towing vehicle does, in my experience, make the failures occur sooner, rather than later. If concerns for the jarring of an HDT tow hitch is a bother, there are receiver mounted suspension hitches that soften up the jarring.
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