You mentioned that your tires had some wear and probably need replacing. If they are over 5 years old and have sidewall cracking they may be ready to blow or come apart underway . A whipping steel belt in the rear can severely damage items like holding tanks, wiring and propane lines. A front tire blowout/failure can cause loss of control. RV tires fail from sitting parked and often fail before they have much tread wear. Web surf and check tire prices, local tire stores will often meet or beat internet prices. Get good quality tires of proper load range and type specified for your rig.