Huh, I suppose that I would assume that wrestling would be adequate training for these types of imbalances. I know a lot of MMA guys have gotten smart and train strongman. We have a couple UFC fighters that train with us from time to time.

In my experience the hardest core work is a very heavy yoke walk. It is much more taxing than farmers on the core. Even with the "balanced" weight, the weights shift, roll, swing and react to your stride. Farmers doesn't do this as much because the weight is still relatively near your own center of gravity. They may swing and sway a touch, but it tends to stay in rhythm with your own natural gait.

Yoke walks (chain yoke vid, similar to the setup I described in the "homeless" thread)

As you can see every step sends the weight swinging. The next step must move you forward, compensate for that swing and causes another swing that you must compensate for. The Pillar of Pain acts the same way.

Suitcase deads are good too. In fact, I would rather see trainees doing these than side bends. The "target" is the same, but the suitcase dead will create a more natural circumstance for that work to occur.