We have experienced issues with dust entering our TM also. The best (worst) example was a trip which terminated with 30 miles of very dry and dusty dirt road in Colorado. After seeing the amount of dust inside the TM I investigated entry points to see if I might be able to seal them. Actually, there are too many.
I did determine, however, that the outside walls at the back of the front shell were not the same distance from the walls of the rear shell at the bottom as they are at the top. There is a gap at the bottom that allows dust to enter. I tried tying the two front shell stirrups together by running a rope from one to the other under the trailer right behind the wheels. This does close the gap and provides a significant improvement.
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