So now I've actually tested the idea (what a concept).
I folded the trailer and connected my supply hose to the new fresh water tank inlet that I attached to the fresh water drain nipple and opened the valve. When the overflow began, I closed off the fresh water drain nipple, turned off the fresh water supply, and opened the fresh water drain valve to equalized the pressure. I closed the fresh water drain valve.
After I opened the trailer, I found a quarter of a paper towel's worth of water on the inside wall. I also found minor water on the curtain of the bathroom window. Of course, your results may vary. I have a 2720SD, so your window placement may differ. Your trail may fold down with the inlet in the middle of a window, or not near a window at all.
Worst Case: put a small piece of tubing in the overflow and run it down the side of the trailer.
I'm calling it a success.
One thing I forgot to mention: A 3/8 inch poly hose won't normally fit on a 5/8 inch garden hose fitting. Place the hose in boiling water until it gets soft enough to force over the fitting.
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