I don't know exactly how the installer is going to do it, but I'm pretty sure there's going to be some nice new holes in my bed.

The compressor will be under the bed also. I thought about putting the compressor inside the bed with the tank to make the install a little easier, but the tank already takes up too much room. There will also have to be some holes to mount the tank. I found out the hard way that it doesn't stay upright by itself. It's a good thing I put 4 thick coats of clear on it, because I gots some buffin' to do.
They'll also be running a switch for the horn, a gauge, and a switch for the compressor into the cab.
The installer does a lot of nice custom work, so I trust that they'll do things right.