Load charts are used to show the maximum what at various lifting heights and boom elevation angles?

The correct choice highlights that load charts are essential to determine the maximum lifting capacity of a telehandler at various heights and boom elevation angles. Load charts provide specific data that indicate how much weight the machine can safely lift depending on its configuration and the angle of the boom. This information is crucial for ensuring safe operation and preventing overloading, which could lead to equipment failure or accidents on the job site.

Understanding the load chart helps operators make informed decisions about how much material can be lifted safely under different conditions. This knowledge is especially important because as the boom reaches further out or lifts higher, the weight capacity decreases, necessitating careful adherence to the specifications outlined in the load chart.

Other options, like driving speed and working angles, do not relate directly to the load charts, which are specifically focused on lifting capacities. Weight capacity is a relevant concept but does not encapsulate the aspect of how that capacity varies with height and boom angle, which is precisely what the load charts provide detailed information about.