What needs to be checked for universal bolts (U-Bolts)?

The correct choice focuses on checking for missing hardware and ensuring that the U-bolts are in proper working condition. Universal bolts are critical components that secure the vehicle's suspension, and any missing hardware could compromise the structural integrity of the suspension system. Ensuring that all components are present and functional is essential for maintaining safety and performance.

Checking for missing hardware indicates a thorough examination, which is key during a pre-trip inspection. If a U-bolt is missing any necessary parts or fasteners, it could lead to a failure in the system, potentially affecting handling and safety while driving.

The other choices touch on various aspects of U-bolt condition but do not address the core importance of verifying that all necessary components are intact. Being painted, assessing for even wear, or confirming adjustability and security, while relevant, do not prioritize the critical aspect of ensuring no parts are missing, which directly impacts safety and reliability.