See also:
“Catastrophic event”
A lot of preppers prepare for a catastrophic event, I personally think in terms of a minimum of 3 years of preparations is a good measure although if rich or so situated I would go for 10 years.
Getting hung up on the Road Warrior stuff is a distraction from most useful prepper discussions, just as were all the years of survivalist discussions getting hijacked by turning them into arguments about how many guns and of what type, for decades almost every survival discussion immediately went to guns and shootouts.