EXHIBIT 1.1 VAN KAMPEN UNIT TRUSTS, TAXABLE INCOME SERIES 143 TRUST AGREEMENT Dated: August 26, 2008 This Trust Agreement among Van Kampen Funds Inc., as Depositor, The Bank of New York Mellon, as Trustee, Standard & Poor's Securities Evaluations,...Trust Agreement • August 26th, 2008 • Van Kampen Unit Trusts Taxable Income Series 143
