I have no electrical background and I'm just thinking out loud but my guess would be that "COMMS" might stand for "Communications" than "Common". A communications wire would allow you to control the functions with a single wire (assuming the other two wires are 12 volt positive and 12 volt negative).
Perhaps it's a new "smart" system that can be controlled like that. The other wires that have not been stripped and are unused may just indicate the RV is pre-wired for the traditional system. There's no way of knowing if the other end is connected without physically checking or testing it, I don't think.
Maybe what I'm saying is total rubbish. If you don't have a copy of the owner's manual, you may be able to search the model number and find it online.