2005 Commercial Driver’s License Manual Catwalk/Steps Check that the catwalk is solid, clear of objects, and securely bolted to tractor frame. Check that steps leading to the cab entry and catwalk (if equipped) are solid, clear of objects, and securely bolted to tractor frame. Mounting Bolts Look for loose or missing mounting brackets, clamps, bolts, or nuts. Both the fifth wheel and the slide mounting must be solidly attached. On other types of coupling systems (i.e., ball hitch, pintle hook, etc, inspect all coupling components and mounting brackets for missing or broken parts.