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  2. Fifth-wheel coupling - Wikipedia

    en.wikipedia.org/wiki/Fifth-wheel_coupling

    The fifth-wheel coupling provides the link between a semi-trailer and the towing truck, tractor unit, leading trailer or dolly. The coupling consists of a kingpin , a 2-or- 3 + 1 ⁄ 2 -inch-diameter (50.8 or 88.9 mm) vertical steel pin protruding from the bottom of the front of the semi-trailer, and a horseshoe-shaped coupling device called a ...

  3. Dolly (trailer) - Wikipedia

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

    Semi-trailer – 1 axle (2 wheels), without the front axle but have a landing gear. Large semi-trailer of truck size is designed for connection via the fifth wheel on the tractor unit or the semi-trailer truck. Small semi-trailer such as travel trailer and boat trailer is designed for connection via a tow hitch of a passenger vehicle. Either ...

  4. Boat trailer - Wikipedia

    en.wikipedia.org/wiki/Boat_trailer

    An empty boat trailer A boat trailer is designed to launch, retrieve, carry and sometimes store boats . As of 2024, the cost of a boat trailer can be anywhere between $700 to $8000, depending on the size and number of axles the trailer has.

  5. Trailer (vehicle) - Wikipedia

    en.wikipedia.org/wiki/Trailer_(vehicle)

    The basic function of a trailer jack is to lift the trailer to a height that allows the trailer to be hitched or unhitched to and from the towing vehicle. Trailer jacks are also used for leveling the trailer during storage. The most common types of trailer jacks are A-frame jacks, swivel jacks, and drop-leg jacks.

  6. Boat dolly - Wikipedia

    en.wikipedia.org/wiki/Boat_dolly

    A boat dolly or boat trolley, also called a launching dolly or launching trolley or simply a dolly or trolley, is a device for launching small boats into the water. It is generally smaller than a boat trailer with smaller wheels and is not suitable for towing a boat on the road. [1]

  7. Locking differential - Wikipedia

    en.wikipedia.org/wiki/Locking_differential

    Automatic lockers lock and unlock automatically with no direct input from the driver. Some automatic locking differential designs ensure that engine power is always transmitted to both wheels, regardless of traction conditions, and will "unlock" only when one wheel is required to spin faster than the other during cornering.