After 2 hours of installation at 35psi I have 1/16 inch more with load. I carry a ramp and wheelchair, a 90 lb ramp and a 210 lb wheelchair. It drops 3 inches and with this product it didn't matter. I called the Airlift Company direct and said it sucks to be you. The company that sold it to me did a great job, delivered my order on time and so on. It's not the fault of the part of the time waster called the product. I have it at 70psi and it made a small difference but the pressure dropped. I soaked the joints with soap and water but no bubbles yet. The leak is so slow that it is difficult to detect.