I don''t nesessarily expect any more stresses or loads just because I am considering a rigid vang instead of a traditional, all line, vang. Its just that the boat was not initially designed for any kind of vang and therefore I would rather find out now that the boom is not strong enough than find out in a blow at sea. However, I do feel that a rigid vang, even though it telescopes, will not be as forgiving as a all line vang. A rigid vang will push and pull etc... The garhauer is the brand that I am considering.