Preheat the oven to 350 degrees. Grease the bottom and sides of a 13”x 9” pan.
Beat the sugar, oil and eggs together in the bowl of an electric mixer fitted with the paddle attachment until thick and sugar has dissolved a bit. Add the vanilla and stir to combine.
In another bowl, whisk together 2 ½ cups flour, cinnamon, baking soda, and salt.
Add the dry ingredients to the wet ingredients. In a small bowl, combine the raisins and walnuts with 1 Tablespoon of flour and add to batter. Fold in the carrots and pineapple and mix well.
Pour batter into pan. It should be super thick. Bake for 45–55 minutes, or until a toothpick comes out clean. Allow cake to cool completely in pan over a wire wrack.