What is necessary for the steps leading to the catwalk?

The necessary step leading to the catwalk should be securely bolted to the tractor frame to ensure safety and stability. A properly secured step prevents any movement while entering or exiting the catwalk, which is crucial when operating in various conditions, especially in busy transport environments where slips and falls could occur. This secure attachment ensures that the step can safely support the weight of a driver or technician who needs to access the catwalk for maintenance or inspection purposes.

In contrast, the other options do not prioritize safety or functionality. While having removable storage features or options for painting may have benefits, they do not address the critical need for stability and security. Loose steps would undermine the very purpose of creating a safe pathway to the catwalk, increasing the risk of accidents. Therefore, ensuring that the step is securely bolted is the most important factor in maintaining safety during pre-trip inspections and routine maintenance.