aren't these shakers also getting their input from sound rather then from telemetry? As such they should shake when hitting a curb, no?
No experience here with actual bass shakers nor SimHub... I just attached some Bose speakerset to my wheelbase to feel vibrations of engine etc., plus my gamechair has a subwoofer in the back, and a shaker built into it (X Rocker).
These both rely solely on audio input to do their thing and not telemetry. But I guess this is kids/toy stuff compared to what you are enquiring about...
I do feel it when hitting curbs!
cheers and I hope someone else here gives you the propper answer you are hoping for. (and I'm curious to read what is said on this topic , as I might be looking into upgrading some day and going for the real stuff).