MatJack Low Pressure Air Lifting Bags (Jumbo Safe Lift Cushions) have been widely used in the towing and recovery industry for decades.  The fire rescue service has begun to embrace the use of low pressure air bags due to the very low air pressure needed (8-10 PSI) and the ability to lift the rated weight through the entire height of the bag.  Matjack low pressure cushions work on volume rather that pressure to create the lift

Matjack low pressure lifting cushions require only 1-3 inches clearance and can lift several tons at the push of a button. Matjack low pressure lifting cushions work best in cantilever or "hinged" style lifts, but can also be used for vertical lifting if rigged correctly so lateral movement of the weight/object being lifted is restricted.