What is the first thing you should do before driving into a trailer with a forklift?

Before driving into a trailer with a forklift, the first thing you should do is ensure that the area is clear of obstacles and that the trailer is properly secured. Check that the trailer's wheels are chocked and that it is properly docked to prevent movement. Additionally, inspect the forklift and its load to ensure they are safe for operation. Finally, communicate with any personnel involved to ensure everyone is aware of your actions.