Brush salmon with about 2 tablespoons of the dressing. In large bowl, toss bell peppers, zucchini and 1 tablespoon of the dressing. Place vegetables in grill basket. Place salmon, skin side down, on grill. Add vegetables to grill. Cover and grill salmon and vegetables over medium heat 10 to 15 minutes, shaking grill basket to turn vegetables occasionally, until salmon flakes easily with fork and vegetables are crisp-tender.