Looking at past data in DQ channels on the ETM suspensions, I tried to estimate the bounce and roll mode frequencies.
I used the top stage V and R degrees of freedom, as well as the oplevs. I used 0.001Hz BW.
I could see the modes in ETMY, but ETMX did not have these modes rung up apparently.

ETMY bounce: 9.730 0.001 Hz
ETMY roll: 13.816 0.001 Hz