Have you read through
this thread?I don't have any insight on your question since our previous rental is a different brand and had only been a rental for a year with a smaller dealership, and then privately owned for 3 years. So our mileage was much lower.
Our age is about the same, though, and you're spot on thinking about stuff that may need repair or replacement. Beyond the regular maintenance stuff, we've replaced the microwave, the hard start capicitor on the A/C, had all of the sealents redone, reinstalled the rear window because of failing butyl tape, and replaced the cyclops. All of that had nothing to do with rental vs. non-rental but age and maintenance.