As TR mentions, it depends on your deal.
If the trust is the borrower and you approved based upon income of the trustees, they should be guarantors or co-borrowers from a credit perspective.
If the trustees are guarantors, you do not report their income. If they are co-borrowers, you do report.
If you do not have the trustees on the deal in any fashion, income is NA for the trust just as it would be if the trustees are guarantors.