Do you think though, that driving through rain might be forcing water into a side seal? Especially if the slide is not sufficiently in, it could be flexing as you are driving down the road letting a gap open and close that you can't see when parked. Just a thought.
At any rate, don't limit your look-see to just the bottom.
Of course, if you take it back for warranty work, they won't find anything, as they won't drive it in the rain.
So if you can discover the problem for them, they might actually fix it. Otherwise, they will likely state they could not find the problem.
Unfortunately leaks can be very difficult to diagnose, and they might just throw stuff at it hoping to fix it...
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