According to Arthur Degraff, the "start of the load/end of drawbar is the point where the keel first touches the trailer (roller) after the winch post. He did go into great detail having mad a quite intensive study of the subject.
Amongst the trailer that he builds are units for towing some very big boats, as well as 8 man jobbies as used by Oxford/Cambridge rowers!!
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It is better to remain silent and be thought a fool, than to speak and remove all doubt!
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