The Best Baked Beans

This is from my sister Bobbi.  Sometimes I don't add the hamburger to make it cheaper :).

1 can Bush's baked beans (28 oz.)
1 can dark kidney beans (drained_
1 can butter beans (drained)
1 c. ketchup
1 c. brown sugar
1 Tbs. liquid smoke
2 Tbs. vinegar
1 lb. browned hamburger
1 large onion (chopped)
1 lb. bacon

Sauté onions and bacon together.  Mix all other ingredients  together in a crockpot and let simmer about 3-4 hours.