You will most likely need to file a Form 1041 for the trust since the revocable trust became a separate taxpaying entity upon the death of your dad.
See https://www.irs.gov/instructions/i1041#idm140229124997744
However, the 1310 should be filed with your dad's individual income tax return if a refund is due. You do not need to send a copy of the trust document.
