Thanks for the replies,
I plan on just using the CB for information (eaves dropping)on road conditions and what truckers are saying. They will chat with you if they feel like talking. Sometimes just better than watching the mile markers go by!
I don't think I would get much range using anything attached to the cab, CBs (from my past experience) like tall, wide open, and centered antennas. With the Class C, tall and centered is impracticable, and they would definitely need a ground plane.
Has any one tried a glass mounted antenna? I wouldn't think they would get much range.