Preheat the oven to 350°.
Spray a 13 x 9" pan with cooking spray.
In the bowl of a stand mixer with the paddle attached mix together the oil, sugar and eggs until light and lemon yellow in color.
Add in the milk and vanilla and blend well.
In a bowl whisk together the flour, baking powder, salt, cinnamon, cloves and nutmeg. Stir in the oats.
Add the flour mixture to the bowl and just blend together.
Add the carrots, zucchini and raisins and stir just until blended.
Spread the batter in the prepared pan and bake for 40 - 45 minutes or until a toothpick comes out clean.
Let the cake rest until completely cooled.
While the cake is cooling you can make the frosting:
In the bowl of a stand mixer with the paddle attached mix together the cream cheese and butter until well blended and smooth.
Add the powdered sugar and the pinch of salt. Blend.
Add one tablespoon of your liquid of choice and mix. If the frosting is spreadable and of a nice consistency don't add any more liquid. If it needs to be thinned a bit more add the second tablespoon.
Spread the frosting over the cooled cake in the pan.