Are trust sederunt books a good source for the study of middle class women?

Along with testaments, trust sederunt books are valuable as sources of information on the property and lifestyles of middle class women, and provision for them by family trusts. A small proportion of trusts were set up by women (which are obviously useful for studying women who owned and disposed of property in their own right), while the majority of family trusts will deal with provision for widows and children of the person who set up the trust.