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A Trailer is generally an unpowered vehicle Pulled by a powered vehicle. Commonly, the term '''trailer''' refers to such vehicles used for transport of goods and materials. Sometimes Recreational Vehicle s, Travel Trailer s, or Mobile Home s with limited living facilities where people can camp or stay have been referred to as trailers. In earlier days, many such vehicles were Towable trailers. UNITED STATES .]] In the United States, the term is sometimes used interchangeably with Wagon s. A Trailer Park is an area where mobile homes are placed for habitation. In the United States trailers ranging in size from Single-axle Dollies to 6-axle, 13.5 ft high, 53 ft long Semi-trailers are commonplace. The latter, when towed as part of a Tractor-trailer or "18-wheeler", carries a large percentage of the freight that travels over land in North America . TYPES OF TRAILERS Backtracking Genset Trailer ]] Some trailers are made for personal (or small business) use with practically any powered vehicle having an appropriate Hitch , but some trailers are part of large trucks called Semi-trailer Truck s for transportation of Cargo . toy trailers and Motorcycle Trailer s can be towed by commonly accessible Pickup Truck or Van , which generally require no special permit beyond a regular Driver's License . Specialized trailers like open-air motorcycle trailers, Bicycle Trailers are much smaller, accessible to small automobiles, as are some simple trailers, pulled by a drawbar and riding on a single set of Axle s. Other trailers, such as utility trailers and Travel Trailer s or Campers come in single and multiple axle varieties, to allow for varying sizes of tow vehicles. There also exist highly specialized trailers, such as Genset Trailer s and their ilk that are also used to power the towing vehicle. Others are custom-built to hold entire kitchens and other specialized equipment used by carnival vendors. There are also trailers for hauling Boat s. Travel trailers Popup Camper ]] See Also: Travel trailer Popup campers are lightweight, Aerodynamic trailers that can be towed by a small car, such as the BMW Air Camper and the Coleman Bayside . They are built to be shorter than the tow vehicle, minimizing drag. Others range from two-axle campers that can be pulled by most mid-sized pickups to trailers that are as long as the host country's law allows for drivers without special permits. Larger campers tend to be fully integrated Recreational Vehicle s, which often are used to tow single-axle dolly trailers to allow the driver to bring small cars on their travels. Semi-trailers See Also: Semi-trailer Semi-trailer truck A semi-trailer is a Trailer without a front Axle . A large proportion of its weight is supported either by a Road Tractor or by a detachable front axle assembly known as a Dolly . A semi-trailer is normally equipped with legs which can be lowered to support it when it is uncoupled. A single trailer cannot exceed a length of 53 feet on interstate highways (unless a special permit is granted) in the United States, however it is possible to link several trailers together. They vary considerably in design, ranging from open-topped grain haulers to normal-looking but Refrigerated 13x53' enclosures. Many semi-trailers are part of semi-trailer trucks. Motorcycle trailer ]] See Also: Motorcycle trailer A Motorcycle Trailer may be a trailer designed to haul Motorcycles behind an automobile or truck. Such trailers may be open or enclosed or open, ranging in size from trailers capable of carrying several motorcycles or only one. They may be designed specifically to carry motorcycles, with ramps and tie-downs, or may be a utility trailer adapted permanently or occasionally to haul one or more motorcycles. Another type of motorcycle trailer is a motorless wheeled frame with a hitch system designed for transporting Cargo by Motorcycle . Motorcycle trailers are often narrow and styled to match the appearance of the motorcycle they are intended to be towed behind. You can get either two wheeled versions or single wheeled version. The single wheeled versions, such as the Unigo (unigo.com) or Pav 40/41, are designed to allow the bike to have all the normal flexibility of a motorcycle. Usualy using a UJ to enable the trailer to lean and turn with the motorcycle. No motorcycle manufacturer recommends that its motorcycles be used to tow a trailer becauses it creates additional safety hazards for motorcyclists. Trailer winches ]] See Also: Winch Trailer winches are designed to load (or unload) boats and other cargo to and from a trailer. The are made up of a ratchet mechanism and cable. The handle on the ratchet mechanism is turned to tighten or loosen the tension on the winch cable. There are both manual and motorized trailer winches. Livestock trailer See Also: Horse trailer There are a number of different styles of trailers used to haul Livestock such as Cattle and Horse s. The most common is the stock trailer, a trailer that is enclosed on the bottom, but has openings at approximately the eye level of the animals to allow ventilation. The Horse Trailer is a more elaborate form of stock trailer. Because horses are usually hauled for the purpose of competition or work, where they must be in peak physical condition, horse trailers are designed for the comfort and safety of the animals. They usually have adjustable vents and windows as well as suspension designed to provide a smooth ride and less stress on the animals. Both stock trailers and horse trailers range in size from small units capable of holding two or three animals, able to be pulled by a Pickup Truck or even a SUV ; to large Semi-trailer s that can haul a significant number of animals. HITCHING A TRAILER See Also: Tow hitch Fifth wheel coupling A trailer coupler is used to secure the trailer to the towing vechicle. 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 draw bar, which is usually removable. The draw bar is secured to the trailer hitch by inserting it into the hitch receiver and pinning it. The three most common types of couplers are Straight Couplers, A-Frame Couplers, and Adjustable Couplers. with Fifth Wheel Coupling .]] Another type of hitch is known as a "fifth" wheel. Fifth Wheel Coupling is used with Gooseneck style trailers to attach the trailer to the bed of the towing vehicle, ahead of the rear wheels. This type of hitch is used for larger trailers and provides considerably more stability than does a traditional bumper-pull hitch. A trailer hitch, Fifth Wheel Coupling or other type of Tow Hitch is needed to Draw a trailer with a car, Truck or other Traction Engine . 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. Some trailers, such as Horse Trailer s, have a built-in jack at the tongue for this purpose. Electrical Components Trailer Taillights are generally connected to the Towing vehicle's electrical system. The electrical wiring for such a set-up may consists of using a Trailer Light Converter , hosted on the towing vehicle, and a 4-way flat wiring connection. In 2007 Uhaul Int'l , for example, used a 4-way Flat wiring connection for the lighting on its trailers."Trailer User Instructions." Uhaul. June 2005. Uhaul Int'l. 13 July 2007 (http://www.uhaul.com/guide/userguide-trailer.pdf), pp.8-9."U-Haul." Wikipedia, The Free Encyclopedia. 10 Jul 2007, 06:50 UTC. Wikimedia Foundation, Inc. 13 Jul 2007 (http://en.wikipedia.org/w/index.php?title=U-Haul&oldid=143675115). The taillights from the towing vehicle, or electrical system, provide the trailer's taillights with appropriate signals and electrical power needed for their operation. REFERENCES SEE ALSO on a single-axle trailer]] Types of Trailers
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