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2. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   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.

3. Towing - Wikipedia

   en.wikipedia.org/wiki/Towing

   The towing source may be a motorized land vehicle, vessel, animal, or human, and the load being anything that can be pulled. These may be joined by a chain, rope, bar, hitch, three-point, fifth wheel, coupling, drawbar, integrated platform, or other means of keeping the objects together while in motion.

4. Tow hitch - Wikipedia

   en.wikipedia.org/wiki/Tow_hitch

   Weight ratings for both bumper-mounted and frame-mounted receiver hitches can be found on the bumper of pickup trucks (for bumper-mounted tow balls) and on the receiver hitch (for frame-mounted receiver hitches). 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 ...

5. Dolly (trailer) - Wikipedia

   en.wikipedia.org/wiki/Dolly_(trailer)

   It is designed to couple to the concerned automobile's powered wheel, i.e. the front wheel of a Front-wheel drive automobile, or the rear wheel of a rear-wheel drive automobile, by locking the powered wheels onto the tow dolly's tray. The tow dolly is tow hitch connected to a tractor or truck. Tow dollies are legal in all 50 US states and Canada.

6. Ballast tractor - Wikipedia

   en.wikipedia.org/wiki/Ballast_tractor

   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 ...

7. Ringfeder - Wikipedia

   en.wikipedia.org/wiki/Ringfeder

   Ringfeder name (pronounced in English / ˈ r ɪ ŋ f iː d ər / RING-fee-dər) is a German brand based in Krefeld founded in 1922. The brand manufactures bolt couplings, hook couplings, drawbar eyes, underrun protections and accessories.