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I saw a trailer once with automatic chocks. They where pieces of wood that where suspended from either side of the mudgaurd and trailed just behind each wheel. When he stopped the boat on the slipway so that he could reverse up remove the rope that attached the car to trailer, the boat rolled back slightly against the chocks and arrested its decent. When he'd hitched up the chocks where raised and attached to the trailer.
I saw something like this on a Fred Dibner program, it was used on a Horse drawn Gypsy Caravan and would be used up steep hills.
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Andy
Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
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