Sid, I agree with Ray the small hand held walkie talkies work extremely well between two vehicles traveling down the highway.

Something like one of these units, http://www.buytwowayradios.com/Produ...ay-Radios.aspx

We only started using the Hand Held CB when Peg is walking me through the parks and getting me set up in the campground, cause we have a CB in the bus, and already had the handheld unit.

Gary S.