This is really a question for the factory, but I can't see a problem as long as you have a rock shield over the rear window. Yes, if the travel occurs in a rainstorm, the wind will tend to blow the rain into the seam where the front and rear shells meet, and although the seal is good, it is probably not perfect against 70 mph air blast. On the other hand, there are actually two seals between the roofs, so I would think that whatever makes it past the outer seal will not make it past the second.
But as I say, I would query the factory. I have seen them trailer-haul three TMs at a time, but they were all facing forward.
Bill
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