Final answer:
The chance of rollover accidents is the main reason for special precautions in maintaining fifteen-passenger vans.
Step-by-step explanation:
The MAIN reason why special precautions are required regarding the maintenance of fifteen-passenger vans is the chance of rollover accidents. These types of vehicles have a higher risk of rollovers due to their design and center of gravity. When the van is fully loaded with passengers, it becomes more unstable, increasing the chances of a rollover.
Although the weight of the vehicle with passengers can contribute to the risk of rollover, it is not the main reason. The size of the tires used on the van and the limited manufacturer warranty provided are not directly related to the precautions required for maintenance.
Learn more about special precautions for maintenance of fifteen-passenger vans