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A trailer coupler is used to secure the trailer to the towing vehicle. The trailer coupler attaches to the trailer ball. This forms a ball and socket connection to allow for relative movement between the towing vehicle and trailer while towing over uneven road surfaces. The trailer ball is mounted to the rear bumper or to a draw bar, which may ...
7-pin blade connector (Towing vehicle side) This is common for RVs and other large trailers which have additional loads beyond the basic for tail lights and brake/turn signals. The standard is defined by SAE J2863, Automotive Trailer Tow Connector. #
Towing capacity is a measure describing the upper limit to the weight of a trailer a vehicle can tow and may be expressed in pounds or kilograms. Some countries require that signs indicating the maximum trailer weight (and in some cases, length) be posted on trucks and buses close to the coupling device. Towing capacity may be lower as declared ...
A tow hitch (or tow bar or trailer hitch in North America [1]) is a device attached to the chassis of a vehicle for towing, or a towbar to an aircraft nose gear. It can take the form of a tow ball to allow swiveling and articulation of a trailer , or a tow pin, or a tow hook with a trailer loop, often used for large or agricultural vehicles ...
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 ...
On travel trailers and fifth-wheel trailers, usually over a certain weight, a supplemental system of stopping the rig is needed. Within the towing vehicle's cab is a trailer brake device that uses the towing vehicle's 12-volt DC current to apply a current to electrically-operated wheel brakes on the trailer's wheels. Engine battery(s)
Before 1932, trailers used only jaw or hook couplings with an eyelet for trailer towing. In 1932, Franz Knöbel developed the trailer hitch with a ball head and socket joint. Franz Knöbel patented the ball head-socket joint trailer hitch invention on March 14, 1934. Westfalia hold a number of towing patents. [5] [3] [6]
Medium-duty tow trucks have a boom capacity of 15 to 20 short tons (14–18 metric tons). Heavy-duty tow trucks, based on chassis used by semi-trucks, with multiple axles and the ability to tow fully-loaded semi-truck and trailer combinations, have a boom capacity from 25 to 50 short tons (23–45 metric tons).