The best overall performer in front, side, and rear tests of nine 4-door midsize SUV models is the redesigned 2009 Nissan Murano, which earns the Top Safety Pick award. The tests were recently conducted by the Insurance Institute for Highway Safety. The Jeep Liberty, Jeep Wrangler 4-door, and Kia Sorento, all 2008 models, are the worst performers in the side test.