The LLV has been around since 1986 and stopped production in 1994, so at the "newest," these sturdy mail trucks are 30 years ...

The old mail trucks had to be unloaded from the back, which resulted in postal workers’ being injured and even killed when they were hit by oncoming vehicles, Mr. Renfroe said.

The only form of cooling in the USPS's old Grumman LLV mail trucks, which have been in service since 1987, was a hilariously small fan or opening the side doors and driving as fast as possible.

The old mail truck, while rugged and dependable, wasn't a lot more than an aluminum box on a General Motors small-truck chassis. Creature comforts, like air conditioning, it did not have.