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A vang system whether ''rigid'' or ''rope & tackle'' will see the SAME exact loads - as a reaction force.
A rigid vang has essentially the same pulley system as a rope & tackle system; therefore, is able to react essentially the same to any shock/impact loads imparted to it (to raise the boom - you''d have to sailing with the mast in the water, keel skywards to realize any other stress handling differences).
The only mechanical difference is that a solid/rigid vang wont ''collapse'' or ''go slack'' when loads are removed.
I LOVE my garhauer rigid vang!