Using a sucker truck is mainly to accomplish what task before trenching?

Using a sucker truck is primarily aimed at locating utilities before trenching. These specialized trucks are equipped with vacuum systems that can safely remove soil and debris around underground utilities, making it easier for workers to identify and locate them without causing damage. This process is crucial in ensuring safety and preventing service interruptions, as striking a utility line during trenching can lead to hazardous situations or costly repairs.

The other options, while related to excavation work, do not accurately reflect the primary purpose of a sucker truck in the context of trenching. For instance, while transporting soil or disposing of excavated material may occur as part of excavation processes, those tasks are not the main function of a sucker truck. Similarly, testing ground density typically involves equipment specifically designed to measure soil compaction and is not a task done with a sucker truck. Thus, the focus on locating utilities highlights the importance of safety and planning in construction and excavation activities.