Cracker Barrel Cucumber Tomato Salad

16 ounces grape tomatoes
2 to 3 medium cucumbers or 2 large cucumbers
1/2 cup sliced white onion
2 tablespoons Italian dressing
1 cup white vinegar
1/2 cup sugar

Slice cumbers into thin 1/4 inch slices. In a bowl mix together vinegar, sugar, and Italian dressing. Add sliced cucumbers, tomatoes, and slide onions. Cover and allow the vegetable to marinate for about an hour before serving.