Carrying 5 gallons of fuel up a dozen or more flights of stairs is hard work on its own.

I've done this job. I only had to do it a few times per day, but it sucked each and every time.

(When I showed up due to a report of an outage for our client's gear at the top of the building, the street was flooded. Water was flowing into a giant metal grating in the sidewalk like something from a cartoon. This grating lead to the basement.

And that basement was where the electrical switchgear was.

It was bad. It stayed bad for a long time.)