For those reading this I have been driving old farm trucks, trucks, pickups ect for over 62 years. Many with used tires and very old tires. When you start to get a shake on your rig.. trailer, motorhome, car, pickup ect that you did not have before it may be a wheel weight but odds are its not. Most common is a tire coming apart. The tubless tires are made with a thin layer of rubber inside to hold the air in. When that thin layer of rubber gets a hole or crack (from setting) inside the air will leak into the area between it and the tread pushing the tread off. A bounce or bump you did not have before should send up red flags. Odds are you have a problem..