Pierce pork with a fork; rub with liquid smoke and salt. Place pork in a 6-qt. slow cooker. Cook, covered, on low until pork is tender, 8-10 hours. , Remove roast; shred with 2 forks. Strain cooking juices; skim fat. Return pork to slow cooker. Stir in enough cooking juices to moisten; heat through. If desired, serve with rice. Freeze option: Freeze cooled meat mixture and juices in freezer containers. To use, partially thaw in refrigerator overnight. Heat through in a saucepan, stirring occasionally; add broth if necessary.