According to the USPS, the windowsill on the right side of the mail truck needs to be as low as the mailbox so the postperson doesn't have to strain their arms or wrists. The new design fixes that.

For over a decade, the government and postal service workers have discussed the need for a new mail truck design. The Next Generation Delivery Vehicle (NGDV) Prototype Design Statement of ...

Within a few years, the fleet will have expanded to 60,000, most of them electric models, serving as the Postal Service’s primary delivery truck from Maine to Hawaii. Once fully deployed ...