What a profitable and inexpensive modification. I'm building my 2015 Toyota 4runner as an overland rig. Now I have a Toyotac full suspension. On my last hike I had a rooftop tent, a cargo ship and trailer from the port with a 160 liter cool box, fridge and all the rest of the gear. The rear end sagged a bit compared to the front, and I could feel it on the freeway. The installation took about 3 hours because I wasn't in a hurry. Jack up the car and remove the 2 rear wheels. I slipped each bag between the coil springs and routed the air line to the trunk. I haven't turned anything off. The hardest part was cutting the rubber bumpers, which I used with the $14 Dewalt saw. I currently have it at 8psi and all I have in the back is my fork cooler and survival gear, which there aren't many.