Where does it leak from? It could just b the end on ur line kit is cracked $13 n change at o'reillys just looked two days ago.While on the topic of the OEM Air Shocks... (Hope this isn't a hijacking!) One of mine leaks out FAST! Can these shocks be rebuilt, or do they have to be outright replaced?
How much psi have you added in the past to handle a load, how heavy was the load & what where the results?