Supplement. I have all the pressures in spec but with 7 or so turns. I want to experiment with stronger bars to see if I can get the pressures correct with less turns and see how that effects the ride. I added the king springs to the back and that helped quite a bit. Before, I couldn't get it to go up to high fully loaded to camp without getting the people out the car. With the Kings it works fine. With that being said it operates more slowly in the front than in the back so I am hoping the stiffer bars will help with that too. I towed a tear drop trailer last camping trip and had the same problem again but it was the front that was the problem. It would go up in the back but the front would try then give up and go back to normal. I could be totally out to lunch but I think I have enough weight on the LX for this to work but have run zero math to back that up. Just a hunch, pretty solid engineering right!