Those little trucks they drive around now are S10s basically. They are called Grumman LLVs.
There are three different kinds of mail carriers.
There are contract carriers that usually drive their own cars and dont have uniforms. That's like very rural.
There are "rural carriers" they are paid less and uniforms are optional but they use post office equipment.
City carriers are kinda like what people think of when they think of the post office, but outside of large cities most offices only have like 1 or 2. You use all post office equipment and they give you a uniform. You also get paid more but the schedule at the moment is 7 days a week, 12 hours a day, and like you basically cant go home until everything is done.
I was a city carrier which is why I dont work for them anymore. It was just stupid during the pandemic. Everyone was quitting, entire floors of the sorting facility were shut down on account of COVID breakouts, and the entire culture, at least at the baltimore office, is solidly toxic.