On our trip to Florida we discovered that some of the clothing in both front wardrobes that was touching the front wall of the trailer was damp. We discovered that water had been coming in from around the two top amber running lights and following the front of the trailer down to a seam that runs horizontally across the inside of the trailer. The seams in both wardrobes was wet.
Hubby went out and put duct tape on them and the water stopped.
When we got home he caulked those lights really well. Then, he went around the whole trailer and recaulked anything that looked suspicious.
Lesson learned---to check all the outside light fixtures and all seams every so often.