Mailing car

You're referring to a "mailing car" or a "mail truck"!

A mailing car is a vehicle used by postal services to transport mail and packages to various destinations. These vehicles are designed to carry large quantities of mail and are often equipped with specialized features such as:

1. Large cargo compartments: To accommodate a high volume of mail and packages.
2. Secure storage: To protect the mail and packages during transportation.
3. Climate control: To maintain a consistent temperature and humidity level to prevent damage to sensitive items.
4. GPS tracking: To monitor the vehicle's location and ensure timely delivery.
5. Specialized equipment: Such as mail sorting machines, scanners, and scales.

Mailing cars come in various sizes, ranging from small vans to large trucks, depending on the volume of mail being transported. They are typically driven by postal workers or contractors who are responsible for delivering mail to customers.

In the United States, the United States Postal Service (USPS) operates a fleet of mailing cars, known as "trucks," to deliver mail and packages to over 157 million addresses daily.