During a tanker pre-trip inspection, what should the driver check on the tank's manhole covers and vents?

TANKER INSPECTION — MANHOLE COVERS AND VENTS: MANHOLE COVERS (top loading hatches): Must be CLOSED and properly secured; gaskets/seals in good condition (no leaks); covers latched correctly; leaking covers can spill product and create hazards; VENTS: Must be clear and working — vents allow air in/out as liquid level changes; a CLOGGED vent can cause: pressure buildup (as temperature rises or during loading) that can damage the tank, or a vacuum (as liquid is removed) that can collapse the tank; ALSO CHECK: tank shell for leaks, dents, corrosion; valves and connections for leaks; tank mounting/attachment; piping and hoses; for hazmat tankers, proper placarding and emergency equipment; SPECIAL TANKER ITEMS: Because the tank is the cargo container, its integrity is critical — leaks waste product and create safety/environmental hazards; proper venting prevents structural damage; tanker inspection includes all standard CMV items PLUS these tank-specific components; leaking or damaged tanks must not be driven.