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Carl,
Our Challenger is the same basic floor plan as your 3400RL. One of the things I do everytime I extend the rooms as part of the set up process is to go to each end of all 4 rooms with the awning hook and make sure that all of the wiper seals are turned in the correct direction. That is that the wiper seal across the top of the room over laps the top of the wiper seals down the sides. If it isn't you can easily use the awning hook to flip them out. If the top wiper overlaps the side wiper, it acts as a shingle to shed or divert any water away.
There probably members of this forum that have heard me describe this procedure before. So far, here in northern Indiana on numerous driving thunderstorms, it has worked.
This is something that can be done on all floor plans to guard against water leaks.
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