U-Haul does not rent trailers intended to be attached to a Ford Explorer. [4] According toU-Haul: "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 forU-Haul."This applies toallproduction yearsand models (for example, this ban includes the Ford ExplorerSportTrac) of the Explorer,regardless of tire brand that is attached. This comes from many accidents involving Bridgestone or Firestone tires. This ban does not apply to related vehicles such as the MercuryMountaineer, Lincoln Aviator, or Mazda Navajo despite that are all mechanically identical to the Ford Explorer.
-from wiki...
It's unfair to rent to not just anyone, mountaineers and aviators but not explorers since they're all the same vehicle just different badges...