I would not buy it for that price with those miles and the history of its working life. any and all plow trucks get beat on as for rust on the bottom of the doors and frame that is typical with that kind of millage. I have rust starting on the inside of the bottom of my doors and it is a 2001 with 89k. All the 7.3 oil pans rust out that is very very typical and if i am not mistaken you have to pull the motor to replace it. other than that it is a great motor and in my opinion the best deisel ever made. Like Ford Flareside said ball joints are allmost a garuntee have to fix especially if it was a plow truck Ford did not even rate crew cab deisels to plow till 04 when the 6.0 came out.
I would not buy it.
Talk to chevotass he has a 95-97 chevy s/c 8'box 2500 deisel he wants to sell.