I use a Cobra Handheld CB in the truck. It's essentially a microphone with the radio controls built in. It connects to a box about the size of a pack of cigarettes that has a
12V connector and a coax connector. It works great! You could free up some mounting space for something cool like an XM radio or MP3 player!
My view of CB is a little different. I DON'T want to hear 90% of what's on there. I DO want to hear only what is close to me. If there's a traffic tie-up I'll know which lane to get in, or if there's something wrong with my rig maybe someone will let me know.
For that purpose all I need is a good squelch function. I turn it up about 3/4 of the way and only the people very close to me come through. The Cobra does a good job at this.
I've found on caravans and at rallies my setup does a more than adequate job hearing or talking to people who are far off. The most important factor is the antenna. I use a magmount with a K-40 right in the middle of the roof on the truck.