The motion tracking characteristics of steering Angle based wheel trailer system were studied. Two mechanism models which satisfy the definition of the steering Angle were present.

分析了基于牵引操舵角的轮式拖车系统的运动跟踪特性，提出了两种满足牵引操舵角概念的机构模型。

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The utility model relates to a hydraulic double-side self-tipping four-wheel trailer which belongs to the technical field of agricultural machinery and uses the original hydraulic system of a tractor.

一种液压双侧自卸四轮挂车属农牧机械技术领域，它用机车原有的液压系 统。

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The mechanism consists of driving device, generator trailer wheel, bicycle front wheel device.

新式车辆部件包括驱动装置，发电拖车车轮，电动自行车前轮装置。

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Carino Vanorden, 24, was at the wheel Wednesday night when a trailer hauling crushed cars broke free of the big rig that was pulling it, cut across a rural, two-lane road and slammed into the minivan, his mother Kate Vanorden of Fayetteville said.

NPR: Runaway Trailer Crashes Rare; NY Accident Killed 7

Trailers are typically attached to tractors by a "fifth wheel, " in which a coupling pin on the trailer fits into the center of a large horseshoe-shaped piece of metal.

NPR: Runaway Trailer Crashes Rare; NY Accident Killed 7