Summer Sausage Hobo Packets Recipe

1 pound summer sausage, cut into 1-inch pieces 4 medium potatoes, peeled and cut into 1/2-inch cubes 3 cups shredded cabbage 1 large sweet onion, halved and sliced 1 medium green pepper, cut into strips 1 medium sweet red pepper, cut into strips 1 small zucchini, sliced 1 small yellow summer squash, sliced 1 pound chicken tenderloins, cut into 1-inch pieces 2 medium tomatoes, cut into wedges 1/2 cup butter, cut into eight cubes 1/4 cup prepared Italian salad dressing