The Conestoga wagon is a heavy, covered wagon that was used extensively during the late eighteenth century, and the nineteenth century, in the eastern United States and Canada. It was large enough to transport loads up to 6 tons and was drawn by horses, mules, or oxen. It was designed to help keep its contents from moving about when in motion and to aid it in crossing rivers and streams. The wagons used in the westward expansion of the United States were, for the most part, ordinary farm wagons fitted with canvas covers. A true Conestoga wagon was too heavy for use on the prairies.