Preheat oven to 350°. In a large bowl, combine the first five ingredients. In another bowl, beat eggs, oil and vanilla. Stir into dry ingredients just until moistened. Fold in mangoes, dates and nuts (batter will be stiff).
Spoon into two greased 8x4-in. loaf pans. Bake for 50-55 minutes or until a toothpick inserted in the center comes out clean. Cool for 10 minutes before removing from pans to wire racks.