During a nice spell of weather, I partially removed the cover on our Tab 320s bd and discovered that the melting snow had created a fair size puddle in the low spot between our rack (Yakima bars plus a Bouge RV aluminum cargo carrier) and the vent cover at the trailer's high point. I looked around and found inflatable bags designed to keep water from pooling on covered patio furniture. A 36" x 72" bag seemed about right to lift the cover where the pool forms, and I puffed it up today and inserted it under the cover above the rack. I inflated it to about a foot thick at the center. It looks like it will do the job, but I'll have to check it after the next snowstorm melt or rain.
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Drone photo with remant of a larger puddle atop the trailer.
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New roof profile with the bag inflated under the cover.
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2023 T@B 320 S Boondock