The Conestoga wagon is a heavy, covered wagon that was used extensively during the late eighteenth century and the nineteenth century in the United States and Canada. It was large enough to transport loads up to 6 tons (5.4 metric 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, though it sometimes leaked unless caulked.