| 摘要 |
The present invention is a trailer extension support dolly with a frame supported by a pair of articulating, free castering support wheels. The trailer extension support dolly attaches between a trailer and a tow vehicle to at least partially support the tongue weight of the trailer. The trailer extension support dolly is attached to the trailer via a conventional ball and socket and a pair of linkage arms extending from the trailer extension support dolly frame rearward to the trailer hitch bar. Each of the trailer extension dolly support wheels is mounted on a respective stub axle which is attached to an articulating axle support bracket via a swivel mount so that each wheel is allowed to caster during turning operations. In order to provide proper castering while going either in a forward direction or a reverse direction, the angle of each axle support bracket is adjustable so that the stub axle swivel connection can be selectively angled forward or rearward. With this adjustment, the support wheels can be alternatively, respectively positioned to freely caster during either forward or reverse steering operations. In an alternative embodiment, the axle support brackets are pivotably attached to a frame which forms an integral part of the trailer and are adjustable in angle to be freely caster in either forward or reverse directions.
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