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Modern fifth wheels allow the trailers to slide into the fifth wheel and lock into it very reliably when maintained and serviced properly. The engagement of the king pin into the fifth-wheel locking mechanism is the only means of connection between tractor and trailer; no other device or safety mechanism is used.
Earlier coupling consisted of in house made metal hitch which had loops to lock drawbar eyes with a pin. Later fifth wheel manufacturers like Jost Rockinger and Ringfeder developed heavy-duty drawbar couplings with a 50 mm loop, drawbars and drawbar eyes which were built with higher quality and standards this increase the safety significantly ...
In the Americas a similar product is used, known as a "pintle hook" (a type of tow hitch). It is a must for a ballast tractor due to lack of a fifth wheel, making drawbar coupling the only option to connect hydraulic modular trailers (HMTs).
For flat deck and pickup trucks towing 10,000-to-30,000-pound (4.5 to 13.6 t) trailers there are fifth wheel and gooseneck hitches. These are used for agriculture, industry, and large recreational trailers. Front trailer hitches are also used on pickup trucks, full-size SUVs, and RVs for multiple purposes. [6]
The drawbar requires a trailer which either loads the drawbar lightly (for example a small boat trailer, or caravan, or the load is the weight of the coupling components only (larger trailers, usually but not always with a steerable hauled axle, front or rear). By contrast, the fifth wheel is designed to transmit a proportion of the load's ...
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