What type of damage should inspectors be particularly concerned about during a vehicle inspection?

Inspectors should be particularly concerned about significant rust or structural damage during a vehicle inspection because such issues can affect the overall safety and integrity of the vehicle. Structural damage compromises the frame or body of the car, which is crucial for maintaining the vehicle's structural integrity, crashworthiness, and overall performance. Rust, especially if it is significant, can lead to further deterioration of components and can even render the vehicle unsafe to operate.

In contrast, while cosmetic damage to the exterior might affect the appearance of the vehicle, it does not typically impact its safety and functionality. Minor dents and scratches, similarly, are superficial and generally not cause for concern regarding the vehicle’s operational capacity. Faulty air conditioning systems, while a discomfort to the driver and passengers, do not directly affect the vehicle's safety. Thus, the focus on structural damage is pivotal for ensuring that the vehicle meets safety standards and is roadworthy.