When operating a forklift before entering a trailer that is not attached to a tractor always make sure that the trailer is?

When operating a forklift before entering a trailer that is not attached to a tractor, always ensure that the trailer is properly supported and secured with wheel chocks or stabilizing devices. This prevents the trailer from moving or tipping while you are inside. Additionally, check that the trailer's doors are securely closed and that there are no obstructions that could pose a hazard during loading or unloading. Safety protocols are crucial to prevent accidents and ensure a safe working environment.