| 摘要 |
At least one video camera mounted upon the tractor part of a truck. An anchor is affixed to the truck so as to prevent any relative motion of anchor and truck, and a rail is affixed to the anchor. A slider is moveably mounted upon the rail so that motion along the rail is allowed but the slider cannot depart from the rail. A camera rack is affixed to the slider but the camera rack and slider are angularly coupled to the trailer/semi-trailer of the truck, so that the rack and any cameras mounted thereon swivel with the trailer, not with the tractor. The angular coupling may be achieved with at least one roller affixed to the camera rack but urged against the trailer. There may be at least two cameras: one showing each side of the trailer.
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