My neighbor across the street just decided to sell his 1985 F-350 dually. It has a shade under 100K miles, 6.9 diesel, auto trans and hasn't worked very hard it's whole life. The truck is in excellent condition with six new tires. I would use it for pulling a 18 ft tandem skidsteer trailer...would only be working it part time. What's a ballpark figure to offer? I haven't paid much attention to what these sorts of rigs are selling for and don't want to alienate a neighbor with a ridiculously low offer. On another note, if anyone has any feedback or advice about those old diesels, mileage, expenses, tendancies, I welcome the information. Thanks, Merry Christmas.