Final answer:
In case of an emergency, stacking too many packages in front of a trailer can block critical access to the trailer, creating a safety hazard by impeding evacuation and emergency response.
Step-by-step explanation:
Stacking too many packages in front of a trailer may block the access from the trailer which is critical in case of an emergency. It is essential to ensure that access to the trailer is not impeded so that in the event of an emergency, individuals can reach safety equipment or exits without obstruction. Blocking access can be a significant safety hazard, potentially preventing emergency response and evacuation.