EXTREME 19 BOAT Northwind Marine, Inc.: Aluminum boat has inflatable collar from Wing Inflatables. Fireboat version features bow-mounted monitor and sponson stability. Powered by Meracruiser Sport Jet; may be powered by outboards, too. Hull has 316-inch marine-grade 5086 aluminum bottom. 19 feet long; seven-foot, 4.5-inch beam; and draft running of five inches. Payload of up to 10 persons (1,450 pounds). (206) 767-4497.