1999 Ford f550 4x4 dump. 7.3 powerstroke with a auto tranny (rebuilt 2000 miles ago). 91k original miles. Issues: Rusty cab, front end clunks, starts via a flip switch because computer is bad. Includes a 10' Western Plow. Truck runs down the road okay, doesn't smoke and stops okay. They're asking $6500. How bad would this rust be to repair? These pics are of the drivers side. Passenger side is pretty solid except for cab corner. I need a truck for about 4000 miles a year to haul debris and tow a bobcat.