Hi, I'm Cam. I am working to get you a fast accurate answer. About your vehicle, This would not be as easy as you thing, Often the air shocks are leaking or even a line. I would check the lines and shocks with soapy water first to see if the leak is in a simple place ore cheap part first.
I'LL DO THIS OR HAVE IT DONE AND GET BACK TO YOU TO PAY OR GO FURTHER THANKS