I don't get onto many dirt roads, but we take about 6 to 8 weekend trips each year. Usually 150 to 200 miles each way.
We get some dust inside. Every fall I completely removed all of our stuff and wipe down the interior. This includes removing the drawers and wiping down the space behind them.
It is never very much, but I don't like it to accumulate forever. It is also a chance to rotate the basic food stock that we keep in the TM all season.
I have been participating in these forums since early 2005. The subject of dust has come up a few times. It does not appear to be a significant issue. Even a regular TT will get dusty inside. But I have no doubt that the TM will be dustier.
Unless you will be driving many miles (10+) of dirt road then I would not expect it to be an issue.
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