I too have the Kenwood TK-3101 GMRS/FRS setup with Autocom and PTT switch...I also have the optional Autocom setup that makes the radio bike powered through the Autocom unit itself so I don't have to worry about the battery dying.
I also have a spare radio for the SO in the chase car but no extra cables. The radio worked well during WFO-5 in receive mode but found I could not transmit. I later learned that I needed to reseat the circuit card inside the Autocom unit. Once I did that it has worked like a champ.
I had used CB in my car years ago but could not stand all the "chatter" in that band.
Unfortunately, I'm not finding that GMRS/FRS is much quieter but I believe signal quality is much better and with the 2 mile range...I find you can quickly get out of range of co channel interference. You can certainly change channels to try and find a clearer frequency but while riding in a group this could be problematic. Better to just put distance between the group and the interfering station.