Low-bed semi-trailers usually use a concave beam (or well-type) frame, with the front section of the frame being a gooseneck (the traction pin in the front section of the gooseneck is connected to the traction saddle on the tractor, and the rear end of the gooseneck is connected to the semitrailer frame connected), the middle section is the cargo platform (the lowest part of the frame), and the rear end is the wheel frame (including wheels).
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