On 4 dinner size plates, place 2 cups lettuce on each. Divide and place chicken on top of the lettuce. Drizzle 1 tablespoon of remaining barbecue sauce over the top of the chicken on each salad. Add to each, beans, tomatoes, corn, onions, all around the plate. Sprinkle the tortilla chips on top and drizzle the ranch dressing on top of each salad or serve on the side. Or, in a large bowl, add all salad ingredients and toss with ranch dressing and barbecue sauce.