For feeding, we use the rubber shallow trugs (often used for horses), one for each pig. Sold in mnay pet shops and horsey places. They are tough and lightweight. Never had a pig trash one yet and they are light enough to pick up and don't get stuck in the mud. Anything heavy just gets completely bogged in in the mud.
If you have a pig not getting its share of food, then just fence off one corner. We use electric fencing for this, works a treat and they soon learn to go to their respective eating stations.