Which issue indicates that the landing legs may not function properly?

The indication that landing legs may not function properly is identified through uneven height or misalignment. When the landing legs are not at the same height or are misaligned, it can compromise their ability to support the chassis evenly and securely. This misalignment may lead to instability when the chassis is in use, which can create safety hazards during loading, unloading, or transport.

Proper functioning landing legs should extend and retract smoothly and should align correctly to maintain the stability of the trailer or container. Uneven heights can also prevent the chassis from resting level on the ground, potentially leading to tipping or other dangerous situations.

While other issues, such as cracks in the coupler plate, excessive grease, or a damaged cross shaft, are important for overall chassis safety and function, they do not directly indicate the operational status of the landing legs in the same immediate and critical way as misalignment or uneven height does. Thus, the focus is on the efficiency and reliability of the landing legs' performance when properly aligned, which makes this issue a clear indicator of potential malfunction.