I work at U-Haul. I've heard it's somewhere around this number (6000), while the field only has about 15k employees to begin with.
This includes many people in the field (the majority), and also some people in the corporate towers (I don't have an estimate of how many laid off from headquarters, but there's over 2,000 people employed here, so I'd guess at least 300-600).
It appears they've eliminated more than $200 million per year just in estimated payroll costs, not to mention healthcare costs.