All the same old car thieves I knew but the heavier ones I need when towing a car trailer I add some air instead to straightening it out Having towed a 4-tail and an old Ford Explorer 98, it handles damn well now, along with some Gabriel light truck shocks up front. The simple install is still the same as I remember it at the hour to install it at the airline I thought about getting an air pump unit from an old Corona Vic or Expedition so it could add air itself.