I came across a 2000 Chevy 2500 4x4 with a 350 v8 and 26k original miles. It includes a Western 7.5 straight plow. Truck runs great, has new brakes (but ABS light is on) and the owner recently fixed up the body/undercoated the frame. Only bondo I could really find on it are on the cab corner. The frame looks like it has the rust of a 10yr old plow truck under the undercoating. What should I offer to get a good deal?