I came up with a hugh throw away of 2x2 feet Carpet squares... These still had sticky on their backs haha..
I put carpet squares under both tent bed ends and of course had to trim a tad to cover the whole floor. I used DARK GREEN color here...
Then I put down 2X2 Carpet squares on the POPUP main floor. I used DARK BLUE color here. One spot was very close to the heat duct coming from the Propane Heater so I used a small section of metal here on the floor in front of the heater vent...
I didn't do any of this per say to a problem you are discussing here... I was never aware our mattress was doing something like you are speaking of... I was looking mainly on putting down something under the POPUP mattress to make a tad warmer to sleep on and prevent drafts from sneaking in around the edges... We also laid down a few of those Air Conditioning foam sections that one installs in the house open window where the installed window air conditioner is installed to prevent drafts. This works great going around the where the POPUP floor meets the installed tent bed fabric ends. Also keeps small things from falling out as well like small flashlights haha...
The Carpet Squares did very well for what I was expecting. Having carpet on the main floor however probably was not the smartest thing I have done. I never knew how much dirt and twigs got carried into the trailer through the front door haha.. I installed one of those HD grated steps allowing one to stomp their feet real hard before entering the trailer.
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Roy Ken