Compressor and Tank Location

[cysko9]

Where is the best place to mount tanks and compressors on a SWB fleet side?

I was thinking on the outside of the frame rail somewhere under the bed, possible right in front of the rear wheel well area...

any ideas? im running front and rear bags also, so if you want to suggest a tank size that would be nice also. I probably won't need a huge amount of air, just enough for one trip up. Id even be willing to fill the front, wait for a refill and fill the rears or something.