Over 40 years ago, my Dad had Air-Lift bags on an old full sized Ford (giant trunk that he would fill with lots of VERY heavy things !). He ran each air hose out to the side and through the pinch weld of the body. They worked GREAT ! You needed to check the vehicle ride height with no load and the bags almost empty. Then fill the bags to their rated max pressure. Finally, load the vehicle and release the air until you were back at the proper ride height. (Filling the bags AFTER loading the vehicle might have allowed the bag to get pinched because they were actually INSIDE of the rear coil spring.)