Preheat oven to 350 degrees F (175 degrees C).
Grease and flour a 9×13-inch baking pan.
Whisk vegetable oil, white sugar, eggs, and 1 teaspoon vanilla extract together in a bowl until smooth.
Combine flour, cinnamon, baking soda, and salt in a separate bowl.
Stir oil mixture into flour mixture until a well-mixed batter forms.
Fold carrots, pineapple, coconut, and walnuts into batter; pour into prepared baking pan.
Bake in the preheated oven until a toothpick inserted in the center comes out clean, about 1 hour; cool completely, about 1 hour.
Whisk confectioners’ sugar, cream cheese, butter, and a dash vanilla extract together in a bowl until well blended; spread over cooled cake.
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