I don't know what sort of system top loaders have to absorb vibration, but I know our front loader at home has 3 struts that allow movement of the drum. The struts have grease on them but after a few years they can get a bit dry which results in the machine vibrating. I tipped the washing machine on it's side, removed the base cover (about 20 screws) and wiped the struts clean then applied new grease.