Mix together 1 gallon of water, the oil, sugar, yeast, salt and vanilla extract in a large 20-quart stand mixer. Then add the flour. Continue mixing and allow a dough ball to form. Toss the dough into a raising bucket and let proof for 1 hour. Once risen, the dough is ready for use. Cut fist-size pieces from the batch and stretch and form into a circle to fit a 9-inch plate.
Fry the dough in batches in a deep-fryer heated to 400 degrees, 30 seconds per side, until golden brown. Top with desired toppings.