If they are living in a city, then they should relocate to an area where the cost of living is lower. They could stretch their dollar a lot more. I have a friend who has been a mail carrier for a long time and she delivers in the suburbs and has excellent health insurance. She loves her job.
I think it's terrible how these mail carriers are treated. Sounds a lot like how Amazon drivers are treated, these big corporations are going to run themselves down if they continue to make employees work in harsh conditions. Also I think the carriers should be making more since they're the ones busting their butts off in terrible conditions to give people their mail. I always heard growing up that a job at the post office was a good one, you'd be set for life but sadly it isn't the case currently and I hope soon they can start making more money soon.