I found with both my old Coleman popup and my Roo that you can occasionally get a drip coming through the seal where the awning attaches to the trailer. The fix was to take some tension off the awning. It seems that too much tension on the awning fabric may pull the attachment bracket away from the wall just enough to allow a slight leak.
2011 Rockwood Signature Ultra Lite 8293SS, 12K Equal-i-zer
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed, 3.73
2010 Rockwood Roo 23SS (2012 - 2014)
2009 Ford F-150 XLT SuperCrew, 5.4L, 4x4, 5'6" bed (2012 - 2016)