Heat grill. In large bowl, combine all vegetables and 2 tablespoons of the salad dressing; toss to coat. Place in grill basket.
When ready to grill, place grill basket on gas grill over medium heat or on charcoal grill 4 to 6 inches from medium coals. Cook 15 minutes or until crisp-tender, shaking grill basket several times to turn and mix vegetables.
To serve, pour cooked vegetables into serving bowl. Add remaining salad dressing; toss to coat.