Forest City, Iowa-based Winnebago Industries Inc. today reported lower revenue and income for its fiscal first quarter, ended Nov. 28. The company noted that motorized unit shipments fell 5.4%, due to manufacturing inefficiencies and a heightened focus on quality while towable revenues grew 24.1%. First-quarter revenues totaled $214.2 million, a decrease of 4.5% versus $224.4 million for the fiscal 2015 period.