I've been running this configuration in my truck for a while now. I figured I might as well document it.
It took a bit of time to figure out all the routing, but the basic power schematic looks like this:
The Larsen Glass Mount Antenna
The External Speaker for the Rig purchased at Fry's
The Duleo GPS Puck Mounted inside the rear pop-out window
The hidden compartment mount of the TinyTrak3Plus and the radio under the back seat of the extracab. It is mounted on the fiberboard top to the rear compartment, so when the lid is installed, no rig is visible and the rear seat can flip down.
The view of the Kenwood G707A remote head mounted on the dashboard under the stereo
Schematic of the power configuration in the vehicle
The mobile power switches for the Kenwood Rig and TinyTrak/GPS