Love these airbags. They fixed my suspension issues. My 2003 Pathfinder sagged slightly in the rear and when I loaded the trailer the headlights were pointing skyward. Never! Plus, storing 5-10 pounds of air in your pockets will make your daily ride that much more comfortable. This is not explained in the installation instructions, and the panhard bar is the bar that runs diagonally from the truck floor to the left-to-right axle. Some people claim this installation took 1.5 hours, it took me about 4 hours and I did it myself. The instructions say a 3/4" hole for the air line through the spring seat, and smaller ones won't fit. I tried a smaller hole first and messed up the air ducts. Air Lift did a great job getting me the replacement parts. Very impressive customer support as it should be These bags are the solution my truck needed.