During a pre-trip inspection, which aspect should the driver check last?

During a pre-trip inspection, checking load security last is essential because it ensures that the vehicle is safe to operate before departing. The load must be appropriately secured to prevent shifting while driving, which could lead to loss of control or accidents. By prioritizing other checks like brake functionality, fluid levels, and lights and reflectors first, the driver confirms that the vehicle is mechanically sound and compliant with safety regulations. After ensuring that the truck is in good working order, verifying the security of the load helps finalize preparations before hitting the road, making it the last critical checkpoint in the inspection process.