Well, if your motorhome is the 2007 itasca sunova 35j listed in your profile, and your tires haven't been replaced, they are probably over 8 years old. 10 years is usually really pushing the limit. That is probably very close to the limit for RV tires, cause we RVers tend to not take good care of our tires. The sun and ozone attacks them and they need to be protected. Therefore you should get some tire covers for your tires. We also seem to fail to keep the proper tire pressure in our tires, and often let them get under inflated. You need to get your motorhome weighted and check your tire manufacturers weight/inflation charts to know the proper PSI for your tires. Tires should be checked for proper inflation at the start of each day of travel, and before pulling out after every break. My best guess if that if your tires are original, you probably need new ones. You can check the DOT tire code to find out how old your tires are.