How does it run with out clothes in it ?
The less you have in it the more it will viberate .
The tub can`t balance it self with just a few item or even worst ,just one.
ok then you may have a broken shock on the unit .
You will need to pull the unit out and remove the rear panel .
and look to see if the shocks are pulled out or broken.
no problem ,glad to assist you .
thank you in advance.