I think you will find the test Clarkson did a while ago was with a porker 911, pug 106 gti and a range rover, the pug stopped in the shortest distance (very light weight car) around just over half the distance, The porker was next a few feet away where as the range rover just mananged to do it in the distance stated in the higway code.

If you think some 2ton 4x4 with wide knobbly tires and a contact patch that is more suited to going through mud, than accelerating and braking is going to stop in a nice short distance, then I hope you don't have one sitting up your backside when you unleash the power of your ap 6pots.