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A lowboy (or low-bed) trailer is a platform semi-trailer with a lowered deck designed for transporting heavy machinery, industrial vehicles and indivisible oversized loads. The reduced loading height (800-900 mm from ground) allows transport of machinery that would exceed the 4-metre maximum height on a conventional semi-trailer.
Transport of loads exceeding standard dimensions or weights requires a special transport permit issued by the competent traffic authority. In Spain this is managed by the DGT. Requirements include: pilot vehicle, special signage, restricted hours (generally overnight on motorways) and specific liability insurance.
Used and new DOLL, Faymonville, Nooteboom lowboys. Official DOLL distributors.