"U-Haul has chosen not to rent behind this tow vehicle based on our history of excessive costs in defending lawsuits involving Ford Explorer towing combinations. This policy does not involve safety issues. This is an unusual circumstance for U-Haul." This applies to all production years and models of the Explorer (including, for example, the Ford Explorer Sport Trac), regardless of tire brand that is attached. This comes from the high rate of failures of Firestone tires installed on the Ford Explorer.