I've been parusing (Spelling?) the 80/100 classified forums lately because I want a camping vehicle to do stuff like the PI trip with the family. Unfortunately my price range puts me in the vehicles that have about 220K miles on them. If the maintenance has been done per recommended frequency at what mileage would you, the avid reader, begin to get concerned with failures of things like piston rings, valves, etc.? When does major engine maintenance become a concern. Is it worth another 10K to get a vehicle in the low 100K mile range? Discuss and thanks.