I'm going to install an OBA system and have a question concerning the air tank. When looking a various setups and diagrams others have done, it seems common to run two lines to the air tank (in & out). Is it acceptable to run a single line to the tank? Or will the system have problems? Below is my layout sketch of the system. FWIW: The tank is going to be mounted in an 80 where the spare tires sits.