In my 2003 2720SD, there are rubber flap seals and fabric overlap seals that are supposed to stop air infiltration at head and foot ends of the set-up mattress. After all these years, the air seals have aged, broken, curled, etc and no longer do their job. Long story short, I cut a long 3-inch diameter foam swimming pool noodle in half lengthwise, and wedged each half into the space between the bedframe and the rear shell sidewall. The foam sits over the fabric and under the rubber on one side, works a little differently on the other side. May need some cutting (serrated steak knife works well) to customize the fit and insure a good seal. Other leak points are the front-facing rectangular gaps at the 2 corners of the front-facing bedframe board. Cut 2 small custom foam pieces about 7 inches by 2 inches to wedge up against those air entry points. Make sure the pool noodle has a simple circle profile with a donut cross-section. They store easy in the back of wardrobe when not needed. An easy peasy solution to a long-standing problem on my TM to-do list!
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