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Dutchmen Manufacturing Co. Inc.’s Aerolite Division has teamed up with top-of-the-line tent and outdoor mattress manufacturer Cascade Designs Inc., Seattle, Wash., to create a Therm-a-Rest self-erecting, all-weather tent extension. The product is available as a $1,200 option on Aerolite Cub and Kodiak hybrid trailers. The Therm-a-Rest tent extension debuted this week at the 43rd Annual National RV Trade Show at the Kentucky Exposition Center in Louisville, Ky. Each tent extension, made from Super-Tech polyester fabric with heat-sealed seams, features a self-inflating insulated outdoor mattress with a pillow top cover. “Once you open the door, it automatically pops open and sets up by itself,” said marketing manger Joe Hosinski. “It is highly weatherproof,” he added. “It’s a full, outdoor extreme-weather tent.”