Many of use use swimming pool noodles on the rear outside.
I have tightened up the seal between the rear shell and the bottom shell behind the wardrobe to close off a gap causing cold air to blow in.
I have replaced all of the foam seals on the door. I have modified the rubber seal at the floor opposite the hinge side, so that it actually works when you close the door. Sometimes I place a dirty towel there to block the draft.
I am not aware of any draft anywhere else.
I don't think we have ever camped much below 40F. We did have a bit of snow at 5,000 feet Memorial day.
We almost never have hookups. I put the furnace on the lowest possible setting, about 55F, when we go to bed.
Not exactly what you were asking.
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