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2. 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 ...

3. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   After all, the purpose of the fifth wheel is to link the tractor and the trailer; indeed, trailers existed before Charles H. Martin introduced the Martin Rocking Fifth Wheel in 1915. At the time, the fifth wheel literally was a wheel that moved with the trailer—unlike today’s technology that secures a kingpin.

4. Wheel chock - Wikipedia

   en.wikipedia.org/wiki/Wheel_chock

   Wheel chocks (or chocks) are wedges of sturdy material placed closely against a vehicle's wheels to prevent accidental movement. Chocks are placed for safety in addition to setting the brakes. The bottom surface is sometimes coated in rubber to enhance grip with the ground. For ease of removal, a rope may be tied to the chock or a set of two ...

5. Chuck (engineering) - Wikipedia

   en.wikipedia.org/wiki/Chuck_(engineering)

   A backplate with a female (self-releasing) taper may seat on the matching male taper of the tapered spindle nose (for lathe work) or of an adapter plate with the same nose, to be mounted on a table. This system improves the repeatability of the mounting concentricity down to a very small total indicated runout (TIR) value. Subtypes:

6. Trucker's hitch - Wikipedia

   en.wikipedia.org/wiki/Trucker's_hitch

   Versions popular in East Asia use variations of sheep shank using either a simple half hitch [11] or a double turn self crossing half hitch [12] or a triple turn self crossing half hitch. [13] A sheep shank with two consecutive half hitches i.e. a clove hitch to secure the upper eye and to form the lower eye is more popular in the west.

7. Dock plate - Wikipedia

   en.wikipedia.org/wiki/Dock_plate

   Dock plates are generally made out of aluminium whilst dock boards are generally made out of steel for greater strength. Aluminium dock plates are more suitable for lighter loads, including the weight of handcarts and dollies, whereas steel dock boards are used for heavier motorized equipment such as fork lift trucks and electric pallet jacks.