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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- -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 fifth wheel ...

  3. D-value (transport) - Wikipedia

    en.wikipedia.org/wiki/D-value_(transport)

    The corresponding formula for a truck and trailer combination, used to determine the required D-value of a coupling, is: T = Weight of towing vehicle including the vertical load on the fifth wheel R = Total weight of the loaded semi-trailer U = Vertical load on the fifth wheel g = Acceleration due to gravity (assumed to be 9.81 m/s 2 )

  4. Caravan (trailer) - Wikipedia

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

    Fifth wheel camper. A fifth-wheel is a travel trailer supported by a hitch in the centre of the bed of a pickup truck instead of a hitch at the back of a vehicle. The special hitch used for fifth-wheels is a smaller version of the one used on 18-wheeler trucks and can be connected by simply driving (backing) the tow vehicle under the trailer ...

  5. Recreational vehicle - Wikipedia

    en.wikipedia.org/wiki/Recreational_vehicle

    A recreational vehicle, often abbreviated as RV, is a motor vehicle or trailer that includes living quarters designed for accommodation. [1] Types of RVs include motorhomes, campervans, coaches, caravans (also known as travel trailers and campers), fifth-wheel trailers, popup campers, and truck campers. Typical amenities of an RV include a ...

  6. Vehicle recovery - Wikipedia

    en.wikipedia.org/wiki/Vehicle_recovery

    Vehicle recovery. Vehicle recovery in Guerrero, Mexico. Vehicle recovery is the recovery of any vehicle to another place, generally speaking with a commercial vehicle known as a recovery vehicle, tow truck or spectacle lift. Recovery can take the form of general recovery, normally of broken down vehicles, or a Statutory Recovery at the request ...

  7. Drawbar (haulage) - Wikipedia

    en.wikipedia.org/wiki/Drawbar_(haulage)

    The drawbar should not be confused with the fifth wheel coupling. 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 ...