Adding an auxiliary air tank?

[Hex]

I've been thinking about adding in an auxiliary tank to the air system of my bus, and I've started to wonder about where to tap it into the system.

I certainly want to get one of the ~65 psi cutoff valves, and it would be awesome to attach the tank to the system -after- the dehumidifier, but I don't want to screw up the air brakes.

For those of you with an auxiliary tank already, where do yours tap in to the compressor?

I'm not in any rush to do this, I want to take time and plan it out ...

Thanks!

(And for what it's worth, I'm looking to run an air horn, air whistle, and tools off the auxiliary tank.)

[Hex]

That's sort of what I was thinking of doing with the extra compressor.

I was wondering about using the tank(s) on a small compressor as the auxiliary tank too, working a way to permenantly attach the compressor to the frame ... How does that sound to folks?