We have a NT 21 FBS with the same awning and had the same concern. Our first outing was last month to the Oregon coast and it RAINED. Left the awning extended half way to keep the entrance a bit dryer. When it started to fill, the supports would retract a bit, the awning would belly down on one end and the water would pour off. We were not exactly level but very close to with the hitch slightly, an inch?, high and the water would exit the aft end of the awning. I live in Seattle and much of our trailering is west of the Cascades during the off season and we do get rain. Now to see how much wind it can take.