Ham radio here. You can hit a repeater from most anywhere, so getting assistance or for emergencies is easy. Even without repeaters a range of 15+ miles is typical. Frequencies are always open/available. Super for 2 or more RV's traveling together.
Need a license, but a couple days of study is no problem. Dash mount radios are more expensive than CB (but multitudes better). However handhelds (walky talkies) are available new for under $50 that again are far better than CB's and still have plenty of power and not much bigger than a cell phone. VERY seldom will you hear anyone on the highway with you, and it is difficult to get any road info. (I have a decal on the back of my RV "146.52 and (my call sign) AI4SR". In thousands of miles of driving never got a call.
For talking to traveling companions, FRS radios are by far the best. Plenty of range (1 TO 3 MILES in the RV) and 5+ outside. Small as a cell phone so great outside in the campground, sightseeing or shopping. I just don't consider CB as usable at all anymore.