Rv tires age out before the wear out due to mileage. There is a DOT date code on the sidewall of your tires. It shows year and week of manufacturer. Most recommend replacing tires between 5 - 7 years after manufacture. Some extend this as far as 10 years, but for safety I think the consensus is 5 - 7.
On your 2017, you likely have a 2016 chassis with tires date coded during 2016 as well.
My 2017 Winnebago has 2016 date codes and I plan to replace them this year.
2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad