Yes, it sounds like something was not closed as 1/8" of dust is a huge leak somewhere. Roof vent would seem to be the likely culprit (put on MaxAir covers if you don't have them). Unless I leave them cracked my windows actually almost glue themselves shut and my front door seals very tight.
That said, there could be a crack around a slide, the front door etc. Have you looked around them in the daylight to see if you can see a crack? I've had to use spray foam and other sealants in the past filling some small cracks on trailers.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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