many of us with various models of motorhomes have had these issues - we've seen it many times in our own Palazzo, even though the bay doors have seals and seem to shut with a good seal.
I've found that while the doors 'seem' sealed, they aren't really. The seals seem fine, but while the coach is traveling, the 'movement' will allow gaps to appear. Water running down the side of the coach can then leak into the tops of the doors. When you open the door later, you may see even a 'waterfall' effect for all the water still sitting on the tops of the doors.
Also, the interior of the bays of these coaches aren't as 'sealed' as you might think. The factory may 'try' to do their best, but since frames are running thru them, and holes are drilled to provide electrical and water line entries, there are really many places where water can intrude, ESPECIALLY when the RV wheels are throwing water behind them as you are traveling. That's a LOT of water to splatter in many places along the underside of the coach, and will certainly find it's way in easily if you are seeing a lot of rain and water on the roadways.
Early on, I drilled several 'weep' holes in my bays for this very reason. Do they help? Not sure, but it made me feel better. : )
I also refoamed many areas of the bays, especially where the frame rails come thru the bays, cable/water/electrical line entry points, and sealed all along the corners and edges and especially the outside edge below the doors.
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the Turners...
two Campers, two Electric cars
former diesel pusher traveler
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