HMMMM, From their own website:
Q: Can anything interfere with the reception of the headsets?
A: Yes. If there is a high source of power, such as a broadcasting wi-fi or power transformer nearby, you may experience a buzz or some static in the headsets. It is usually not enough to keep you from communicating. If there is an AM radio station operating nearby on close to the same frequency, you may hear it. Anything that interferes with an AM radio will interfere with the headsets. In some coaches it is necessary to turn off the ventilation fan to prevent interference while maneuvering. In most cases, and in the typical locations you would be using the headsets (campgrounds, RV parks), these are not issues.
O.K. AM radio stations are EVERYWHERE and most RV parks these days do have WIFI. Since a good number of us (from other discussions) have a CB in their rig why not just get a CB handheld for the wife to use? FRS and GMRS are FM so much better clarity, no disturbance of the signals and work over a much longer range. For us we are glad to have the backup camera with the audio built in, I can hear what the wife is saying to me even though I can't talk to her it just usually isn't a problem.
I don't think I would buy these over FRS or GMRS