The Rapid Jack is your best friend when it comes to fixing a flat tire or removing a wheel on your multi-axle trailer. Simply place the small end of the Rapid Jack under the closest good tire and drive up! Nothing could be easier! It can also be used as a jack wheel holder, a jack post block, and a pad block. Doubles as a wheel chock. It's the fastest jack around, we call it 'Rapid' for a reason!