We have a 2004 Tioga 26Q, bought new in 2003, had to replace roof AC unit, fridge, fresh water pump , awning fabric and minor stuff after about ten years. I think there is a spike in major item replacements at about the ten year point. Of course you'll need to replace tires every 5-6 years. After that, a well maintained rig shouldn't need big dollar fixes for another ten years, your experience may be different. T'would be interesting to see cost comparisons on trading up for a new rig every 8-10 years vs keeping a rig repaired for 20 years. Many wouldn't want to keep a rig for 20 years unless they had indoor storage facilities to keep it looking newish.