Well, this was for several weeks at a time, so it wasn't an eqipment breakdown. They told us once that whoever got back to the office first after completing their second route got to do our route.
I don't know. My brother in law was a mail carrier for a decade or so. For a while he used his own car, but leaning across the whole car to put mail in the boxes was tearing up his back. They had some scheme where you paid a rental contract for your USPS vehicle, it was automatically deducted from your pay. A few long-timers supposedly just bought the vehicle, and didn't have to pay the interest. I'm just a tad hazy on the details But, I gather that the USPS owns most of the vehicles, but the carriers have to either "buy" them, which I guess is really some kind of long-term lease, or they have to rent them month to month. Anyway, that's what I got from the B-I-L.
Jon