Topic came up during web search. In nsw can have up to 5m overhang provided trailer is single axle, boat or boats is or are , a rowing boat; shell, canoe, kayak,,, trailer is purposed to carry such vessel and exception document is carried in vehicle. Document can be found using Google at, ' kayak overhang exception, ' or similar.
Hope it helps someone. A bit late, different state, if everyone's a captain whom be dare mate.