Tenderloin cooks much faster in the slow cooker than other cuts of pork. It was done in about 3½ hours on High. A thin sauce will work best; you want to keep the meat moist, but you don’t want to drown it.
— Shelby Kinnaird
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Cut each tenderloin in half cross-wise. Place two pieces in a slow cooker parallel to each other; then place the other two pieces on top parallel to each other and turned at a 90° angle to the bottom two pieces. Pour sauce on top.
Cook on High for about 3-1/2 hours. Use two forks to shred meat and mix well with liquid in bottom of pot. Turn to Low and let cook an additional 15 minutes or so.