Throughout its history Jeep has built unique vehicles with world-beating off-road ability, while the brand’s various corporate owners have suffered disastrous fates. Jeep has often found itself the only profitable division of an automaker on the ropes. Fiat or whichever other company might be tempted to acquire Jeep should consider that, next to the Hope Diamond or the Maltese Falcon, few enterprises have brought worse luck to their owners.