Holden's Jack8 Off-Roader Rides On The Wild Side Holden has transformed a mild-mannered Jackaroo four wheel drive wagon into a decidedly wild off-road showcar which goes by the name of Jack8. The radically revamped topless two-door is powered by a muscular version of Holden's Gen III V8 and will make its 4WD show circuit debut this week at the Melbourne National 4x4 Show. With a body raised 50mm above the chassis, a roll cage replacing the roof,…