It was a day of blistering heat in Southern California, and now the family of mail carrier Peggy Frank, 63, ... Here’s How Hot It Is Inside a Mail Truck. News. July 19, 2018.

The new truck, which will come to a neighborhood near you starting in 2023, will be designed and manufactured by Oshkosh Defense, a tactical vehicle manufacturer.

When the U.S. Postal Service unveiled the duck-like design for its new mail truck last year, it said that the new design could run on either gas or electricity. But the agency now plans to make ...