If you are going to use airbags, get extensive practice with them before you go out in the field the first time. Fire Dept.'s and HD wrecker companies practice with these things a couple of times per year, and they still have accidents with them, some times with catastrophic results. Friend of a friend drives an HD wrecker, they practice with theirs 8 hrs every 3 months, and inspect them after every use, few years back they used them on a rolled semi, one of the bags was pin pricked by a piece of steel. Next day while using them, that bag blew out and knocked a fire fighter standing nearby on his butt, breaking his tail bone. They are not under much pressure, but, are still capable of great harm.