Which type of vehicle should never have its air deflated?

The correct answer is based on the understanding of vehicle types and their structure. Commercial vehicles typically have specialized systems and features that are crucial for their operation, including air brake systems that rely on proper tire pressure. Deflating the tires of commercial vehicles can compromise their ability to operate safely and effectively, especially if they are equipped with air suspension or air braking systems.

Passenger vehicles, trucks, and motorhomes may have suspensions and braking systems that can still function adequately with some variation in tire pressure, but commercial vehicles are heavily reliant on maintaining their tire pressure for operational safety, load-bearing capabilities, and overall performance. Therefore, it is essential to ensure that the tires of commercial vehicles are not deflated in any situation that could impair their necessary functions.