Hello Kev,
As previous contributors have said, towing in high wind speeds must be done with extreme caution, and if conditions are bad enough don't tow.
No one can give an exact wind speed figure that will cause problems, it will be different for each outfit, and it will also depend on wind direction, gusting etc.
If the authorities are warning lorries and high sided vehicles about wind conditions, then I would suggest you don't tow, but because of the axle arrangements of caravans they are inherently less stable than most lorries in windy conditions. Consequently
lesser conditions can be a problem for caravans and high sided trailers, but unfortunately there is no clear guidance that can be given.
Ultimately its your own decision, and you perhaps need to try out towing in different conditions and note when the average wind speed begins to make you thing things become slightly unsettled.
I think that your comments about crane limits are probably quite sensible, and if nothing else may be a starting point - but do be careful.
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