| 摘要 |
A pivotal trailer extension including a pivotable platform mounted to an upwardly extending support member for trailers. The platform has mounted thereon a winch and a "V"-shaped chock block. The platform is dynamically pivoted when the bow of the boat is winched onto the trailer and into the "V" block during the loading of the boat from the water at a sloped boat dock and remains fully chock-up as the floating boat settles on the bunks when the trailer is pulled from the water.
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