I got into a shouting match once with the automotive supervisor, I had picked up a nail or screw or something in my front tire and it was going flat, so I pulled into a Les Schwab tire shop on my route to have them look at it. They showed me where it was poking into the sidewall, making the tire impossible to repair.
Well, the automotive sup didn't want to pay for a road call and he sure as hell didn't want to pay for a tire from a retail chain, so he told me to have them remove one of the dual wheels from the back and swap it onto the front. "You can drive with one flat tire in the back, just limp it home and we will take care of it tonight."
I refused to do this, saying it was unsafe. The thing could blow out and catch on fire, or throw chunks of rubber behind the truck at other vehicles. UPS makes $15 billion a year, they can afford $189.95 for a damn tire.
He kept yelling at me so I hung up, called my center manager, and told him that I was just going to sit there in the lobby of the tire shop making $45 an hour on overtime until they either sent me a new truck or approved the replacement of the tire. My center manager called the tire shop, gave them a credit card #, and 10 minutes later I was SAFELY back on the road.