I sense that this may be a loaded question because there are so many factors involved. What would the life span of a properly maintained coach be? I understand there are so many different manufa...
Sure, things will break and need to be fixed/replaced, but that will happen with any rig. Barring catastrophe or neglect, the end-of-life for most coaches are when 'proper maintenance' doesn't make financial sense any more given the value of the unit. But ignoring that, you can make any unit last just about forever.