No it is not required. Surety trusts provide a limited liability form of private insurance. This type of insurance is typically used by the extremely wealthy with many physical assets to protect. No asset goes into a Surety Trust, it simply holds a bank account that contains other trusts insurance premium payments as collateral. It will have signed Private Security Agreements and/or perfected (filed) UCC-1s against its debtors [those insured by it].