- Prairie Schooners The most common wagons used for hauling freight back East were the Conestogas, developed in Pennsylvania by descendants of Dutch colonists. Conestoga wagons were large, heavy, and had beds shaped somewhat like boats, with angled ends and a floor that sloped to the middle so barrels wouldn't roll out when the wagon was climbing or descending a hill. Like the covered wagons of ...www.endoftheoregontrail.org/wagons.html