Brian and Bruce Frank have five Schweiss Doors bifold doors in use on their two farms near Olivia and Bird Island, MN, and they couldn’t be happier with any other style of door on the market. The Franks’ farm is 1,600 acres, growing corn, soybeans, sugar beets, sweetcorn, peas, navy beans and some wheat. The Franks also perform some custom sugar beet harvesting for area farmers.