Thanks for all the feedback. I'll be working on it soon. WA5LTA, I put the "factory" Sirius in myself and then antenna is near the back of the roof. The sunroof doesn't come that far back, so there is room to put the antenna there and run wires down the back pillar or around to the side and down the a-pillar (which is what the Sirius wiring does).
But, I'm planning on using mounts that go in the stake pockets in the bed and do twin whip antennas, one for the ham and one for the CB. So, thank you GoCarGo for the tip on how to get out the back without drilling.