The Ready Rescue looks like it uses CB channels 1-39. I think it is an emergency radio just in that it is not designed for regular use, but to be kept in a car and plugged in when needed, with the emergency and HWY conditions channels being flagged as they should be the most heavily monitored.
If it is in S4, it should work with a TRC-212 unless the 212 is set to channel 40.