If a truck driver reports a light tire thump, what could be a probable cause?

A light tire thump can often be attributed to an out-of-balance tire. When a tire is not properly balanced, it can cause vibrations and irregular contact with the road surface, leading to a noticeable thumping sound. This imbalance can occur due to uneven weight distribution within the tire, which can be caused by factors such as a manufacturing defect or the addition of weights that may have come loose or fallen off.

While low tire pressure, a faulty suspension system, and worn wheel bearings can also lead to issues in the vehicle's operation and ride quality, the specific symptom of a thump when driving is closely related to the tire's balance. Low tire pressure typically results in a softer ride and may cause a different sound or feel, while a faulty suspension or worn wheel bearings would usually present with distinct handling problems or greater noise. Therefore, the characteristic of a light tire thump is most directly associated with an out-of-balance tire.