In the event of a major event, warranties will not do much for you. They are good to have during your typical daily operations, covering part failures as needed with as little as one day turn around time, but when things go really bad you can't count on them. As was the case with Hurricane / "Superstorm" Sandy, transportation was severely impacted and nothing was getting moved into or out of the effected region. You need to "self warranty" as much as you can, and as much as it reasonable to.