There is a company producing this. It is a product designed so that if you have to tow a heavy object, the weight of the pull is always on the centre of the transom, regardless of the angle of the boat and the tow line. A last saw this displayed at Seawork 2008. It was quite close to where Andre had his Parker, so may remember it.
Will keep an eye out at the boatshow next week for you.
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