No, a 'unit' is simply equity in any business entity not structured as a Corporation; that is, corporations have shares of stock, and partnerships / trusts have units. Royalty trusts and publicly-traded partnerships have units that can be traded on exchanges, file financials and other information with the SEC, and so on--in other words, very different from families or individuals placing assets into a trust. Those kinds of trusts, there won't be much in the public record beyond standard charter documents filed with the secretary of state's office. This isn't your trust.