Place chicken in a large re-sealable plastic bag with 1 C dressing. Place carrots, onion and zucchini in another large re-sealable plastic bag with remaining 1 C dressing. Place both bags in refrigerator and marinate 4 hours.

Preheat grill to medium heat.

Place wrapped corn on grill and cook, turning often about 15 minutes. Set aside to cool. When cool enough to handle, cut the kernels from cob. Set aside.

Place chicken and vegetables on grill over medium heat, discard marinade. Cook until vegetables are tender and chicken is cooked through, about 10-12 minutes. Remove from grill and place on cutting board. Chop chicken and vegetables into bite sized pieces.

Layer salad in a large glass bowl or trifle bowlin this order: lettuce, onions, cucumber, corn, carroty and zucchini and finally top with the chicken.