I had the exact same problem with my RapidRoad not working on my XSurf-100 in my A4000 and no matter what I tried I couldn’t get it to work ...Poseidon always found it as working under ‘controllers’ though
after nearly sending it in to Individual Computers for repair I realaized I had an empty clock port on my Buddha IDE controller so installed the RapidRod on it and bang she’s working great now
So for me anyhow the issue was on the XSurf-100 side....let us know what your findings are once you finally get your RapidRoad working