Cook macaroni according to package instructions, until just al dente. Transfer cooked macaroni to a colander and run cold water over it until thoroughly cooled. Drain VERY well.
Transfer drained macaroni to a large mixing bowl and add the tomato, green pepper, red onion, bacon, and cheddar. Fold to combine.
In a small bowl, whisk together the mayonnaise, sour cream, rice vinegar, ranch seasoning, and black pepper.
Pour the dressing over the macaroni mixture and fold to combine - enjoy immediately, if you like. Otherwise, if you're planning to chill it first, reserve about ⅓ cup of the dressing and store it in a covered container in the fridge. Fold the rest of the dressing into the salad, cover the salad tightly, and refrigerate. When you're ready to eat it, fold the reserved dressing into the salad, then enjoy.
