Short Version:
The mobile CB needs to be an Export AM/FM/SSB w/NRC designation PLUS antenna at roof center 5’ or taller (7’ preferably) with clean DC power and some vehicle RFI panel bonding. A hi-fi audio speaker strongly recommended.
This radio rig renders much if not most voice to nearly two-way business radio standard.
As in post above there’s then no reason ones Receive won’t be filled 85% of the time on AM-19 (travelers channel) given daylight hours (an hour before sunrise to an hour past sunset) on weekdays.
I’ve been coast-to-coast and border-to-border most of the past fifteen years. Poor radio rig is typical. The goal to overcome in TX/RX.
If you don’t hear anything, speak up. Have something to talk about (shared concerns of weather, traffic blockages, etc). Correlate it to mile markers or map points (towns or crossings).
“Hey, southbound, were you out of that rain by mile marker 220 or so?” Where did it start?
Be persistent, overall. Once it becomes habit (welcoming others) it’ll grow. Others will join in.
Try to problem-solve and men will show up
(Have your wife ask the question, then you take the mic).
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