1800 hrs is that 50 or 75 percent worn out? Even though he says mostly trolling hrs. That can be a bad thing too. Example being. When an engine is idleing, the oil pressure is at its lowest. The top end of the engine wouldn't get alot of oil up there compared to higher rpms. At my work we do alot of camshafts from pickups idling all day. ram 3.6 is really bad for it. Something to think about. How much to rebuild it? Even though the compression numbers are good, keep in mind there s alot of bearings that could be worn out too. Cam cam bearings crank brgs rods.... just food for thought.
If it was me I would pass.