As part of my truck build I am adding an auxiliary air tank to run the accessories I am adding. The tank will supply the TrailerSaver air hitch and air horns. I might also use this tank as a source to air tires and such. I plan to put gauges in the cab to monitor this tank and the tank that supplies the transmission.
I looked at several mounting locations but ended up mounting it next to the other air tanks. I tilted it slightly to allow the moisture to accumlate at the drain.
Supplying the air horn solenoids.
I supplied the tank from the primary tank using a protection valve. I would have preferred to use the secondary tank but there was no room for the valve. I try to use compression fittings as much as possible.