For them, getting stuck in somebody’s driveway screws up the whole day.
We worked with them on transmissions, they are quite sharp when it comes to fleet management, maintenance, etc. They calculate their cost/mile down to several places.
Teamsters union labor, but they work them hard.
I got that idea from my brother. The reason they stuck with him was that he invented a machining method to reduce the failure rate on remanufactured starters to such a low level that his product was nearly completely reliable. That is, "like-new." That near-zero failure rate was everything to UPS, as you indicated.