Which component enhances the structural integrity of a ladder?

The component that enhances the structural integrity of a ladder is truss blocks. Truss blocks are critical in providing support and stability to the ladder's frame. They connect the side rails and help distribute weight more evenly, which ensures that the ladder can bear the load applied to it without twisting or bending.

In the context of a ladder, the design incorporates truss blocks to minimize any potential flexing when a firefighter or equipment is on the ladder. This feature is crucial, especially in emergency situations where the safety of personnel is paramount. Overall, the presence of truss blocks contributes significantly to the overall strength and rigidity of the ladder, making it safer and more reliable during use.