Since the Studio isn't built on concrete, I have a lot of OOB problems in there! When the machines start shaking violently I shut them off and re-distribute. The Frankenmore generally doesn't have a problem with OOB loads, but will shake if it does. The GE and 1-18 also like to shake. Only the Unimatic has an OOB switch which shuts the timer off, but that only has a problem when spinning out the water and getting up to speed. At the full 1140 it spins fine, although if the load is a little "off" it will vibrate. Before I adjusted the Rustinghouse's (front-loader with a straight front; Dual-Tumble design) leveling legs, it would tend to "hop" as it started spinning!
Up at the house, the '03 Maytag is the absolute best at handling off-balance loads. The tub can be doing its usual gyration, but the cabinet stays smooth. Only once did the off-balance switch trip, and that was with some bathroom rugs. It never has again. Before that, the '98 DD Kenmore liked to make a lot of noise, shaking and rattling. The '96 plastic GE handled them well because of its soft suspension, and the '86 White-Westinghouse (top-loader) wasn't bad, though I do remember it shaking a few times.
The worst was before I was even born. Parents had a WCI/Montgomery Ward set from 1983 I believe in their old house. Laundry room had two doors; one inside the house that pushed in to open and another to the garage. Apparently that washer had a habit of walking during spin, and would walk right in front of the inside door and block it so no one could get in. Whoever was in the house at the time had to go around to the garage to get to the laundry room and schlep the washer back in its place. The washer moved with them to their next house, and didn't walk after that, but was replaced for one reason or another. Why this particular machine liked to walk, and the next White-Westinghouse didn't is beyond me since they are basically the same machine. Had it been a Norge-made set, that problem would have never existed.
--Austin