I think the vibrator would have to do with the shocks and suspension
That would be painfull, if you hit a big bump.
I think it would be better to install a fleshlight on the gas tank.
But seriously, people shouldn't buy Harleys.
It would be better if people bought Jap bikes made in the US.
the inlne 4 cylinder is so far superior to the 45deg V-twin.