Preheat the oven to 325 F.
In a large bowl combine the flour, salt, baking soda, cinnamon, and nutmeg. Mix until everything is well combined then set to the side.
In another large mixing bowl add the eggs, vegetable oil, and sugar. Mix until well combined, then add in the apple sauce, bananas, pineapple, and vanilla. Mix.
Now slow start adding in the flour mixer, and mix the batter until everything is well combined.
Once the batter is nice and creamy, set it to the side.
Lightly butter or oil a 9x13, then pour in the cake batter.
Place the cake in the oven and let it bake for about 1 hour and 20 minutes
Let the cake cool until it's at room temperature.
Mix all the ingredients for the cream cheese frosting, then frost the cake.
Let the cake sit for 30 minutes before serving.
Serve and enjoy!