Uhg - been there done that on the bearings, u-joints, shocks and bearings....not a lot of fun but what a difference!
I am still chasing vibrations out of my drivetrain. I think it's isolated to a loosening output shaft from the transmission. This device sounds good but I'd like to hear from someone who's used it. The website leaves a lot to be desired.
One thing I've noticed since doing all of the same things is that all the noises, creaks, rattles and groans from the suspension/drivetrain are gone but now I can hear all of the noises, creaks, rattles and groans from inside the coach
- kind of like that "whack a mole" game at the county fair.