Diesel engine and generator serviced every year by an authorized Freightliner or Cummins service center. Will get 11-12 mpg at 55 mph. Used primarily for business. Real leather upholstery (10k) install three years so. New radiator, DEF tank and sensors. New AGM batteries. Slides maintained by Thor service center every three years. Kept on top of things so I had one breakdown on the road in eight years. Full wall slide and bedroom slide. Washer, dryer, microwave/convection oven, extra large exterior storage. Upgraded to a Newmar New Aire.