What should be done if concrete is too tight in the truck bed during dumping?

In the process of transporting and dumping concrete, it's vital to ensure that the load is managed properly to avoid complications during the unloading process. Option D emphasizes the importance of not piling concrete pieces higher than the tailgate hinge pin, as this ensures that the load remains stable and easily manageable.

When concrete is piled too high, it increases the risk of it becoming too compacted or stuck in the truck bed during the dumping process. This can lead to difficulty in unloading and may result in the need for unsafe measures to dislodge the concrete. By adhering to the guideline of keeping the load below the tailgate hinge pin, operators can minimize the chances of encountering a situation where the concrete is too tight, thus ensuring a smoother and safer unloading process.

The other options involve methods that could be unsafe or ineffective. Forcing the truck to shake or using a hammer to dislodge concrete can damage the truck or the concrete, and may pose safety risks. Carefully repositioning the load is a better practice, yet without controlling the height of the load initially, the repositioning may not resolve the issue of compaction. Therefore, maintaining proper load height is key to preventing issues during unloading.