The CB radiois limited to 4 watts by the guvment. A good radio with an excellent antenna, away from a large city with a lot of interferance can work 4 or 5 miles. The single, dual-use antenna, until recently did not work well. There is a company called Sierra Electronics that has done a good job with one sold for the Goldwing motorcycle.
When traveling with others or when at a function where the CB is used for announcements, or coordinating activities, or even for summonsing (is that a word?) help, then a good, workable, and trustworthy CB is a great asset. A handheld one is a very viable alternative, and it can be transported from tow vehicle to towed unit. Personally, I have one in each of the above, and a good handheld as a stanby. I have found them valuable on WBCCI caravans as well as rallies. I also have used them and channel 19 to work around traffic tieups,etc