One of our favorite ways to have Pork Roast in the crockpot is with Sauerkraut.
Put Roast in crockpot, add one diced onion, 1/2 C water and a bag of refrigerated Sauerkraut. Cook 6 to 8 hours.
Serve with mashed potatoes.
Kraut makes the pork tender, the pork mellows the kraut flavor. mmmmm. good!!