If desired, substitute 1 cup sour cream for half the mayonnaise.
Fill a 9 by 13 dish 1/2 full of shredded lettuce.
In layers over lettuce add remaining ingredients, one at a time.
Spread over top: 2 cups mayonnaise and sprinkle with 2 tablespoons sugar.
Then with 2 cups grated cheese.
Bacon on top.
Cover and chill overnight.