Well, industry advice is to change motorhome tires every 6 years. After this age, the rubber is less malleable, with a higher risk of tire sidewall/cracking and blowouts. And I follow it. Having worked on one project with the guys from
https://www.topwritersreview.com/reviews/apstudynotes/, I read a lot of information about tires, including other people's opinions and feedback. Of course, the best brands are Goodyear, Bridgestone, and Michelin. Though I bought Maxxis M8008 ST tires two years ago. They are great and I'm please with the purchase. As for the Chinese tires, yes, most people don't trust them, but you know, the Chinese products might be of different quality.