Blue1985 IH S1600 flat bed with 6.9l idi and 4 spd auto allison trans

1985 IH S1600 stake bed truck that was previously used by the Air Force here in Mi. Truck fires right up runs like a top. shifts smooth. and stops on a dime. It has a 6. 9L idi mated to a 4 spd auto allison trans. The rear end in 5. 35 so with the 4 spd it tops out at 55mph. The flat bed is 7x12 with 3 ft sides. There are no rear gates. Tires are retreads and in decent shape. Has a 4. 5 ton weight capacity. Has 2 brand new batteries purchased 01/15/2015. Please ask any questions.