Marinated Vegetable Bean Salad Recipe

2 cans (16 ounces each) kidney beans, rinsed and drained 2 cans (14-1/2 ounces each) cut green beans, drained 2 cans (14-1/2 ounces each) wax beans, drained 1 jar (10 ounces) small pimiento-stuffed olives 6 cups fresh broccoli florets, finely chopped (about 2 pounds) 2 medium green peppers, chopped 2 medium sweet red peppers, chopped 1 medium red onion, chopped 1 teaspoon dried basil 1/2 teaspoon garlic salt 1 bottle (16 ounces) Italian salad dressing