I'm a new owner of a used 2009 Coyote LE Hybrid. I noticed the lower front outside panel delaminating. Does any know if this is a common problem? If so, Wherw did the water get in? I spotted some water stains on the inside of the hinge area. There is some sort of cheap vinyl held by Velcro that covers an air gap at the piano hinge. Any advice would be helpful.
Water leaks are extremely difficult to find because water tends to wick and migrate. the best suggestion that I have is to go over every square inch of the trailer and inspect the seals and caulking and replace or recaulk everything that is questionable. Run water over the trailer open and closed and inspect the area in question. The best way that I know is to have the trailer open during a heavy rain and sit inside and watch. You may never find the problem though. I have a desk in my trailer and every time I went into it while not in use I would find a water stain about as big as a quarter on the desk nowhere else. Nothing else wet or stained. This went on for about 6 years I sat inside while it was raining and never found anything. Finally one year while cleaning the windows I found that the window drain was clogged. I cleaned out the drain hole and the problem went away. Something that small can cause you a mountain of grief.
2018 KZ Durango Gold 384RLT / 2020 Ram 3500 DRW CC LB 6.7 Cummins Auto 4.10 axle Demco Premier
You should do a pressure test to find any and all leaks. Here is a video to give you the basic idea: link
You can do this yourself cheaply by closing up the RV and opening one roof vent. Next place a cheap plastic tub upside down over the open vent. Cut a hole in the tub to fit a leaf blower. Add weight on top of the tub so it stays in place. Turn on the blower and spray the soapy water everywhere that a problem might exist. Take photos of any bubbling that you find for reference. Hose off the soap as you go so it doesn't dry on. Good Luck.
I guess you could try it when open but it would probably blow air at nearly any fabric to body connection. My thought is that it is open only a fraction of the time and only gets rained on a small portion of that time. Delamination follows long term containment of water within the wall. Since you haven't seen water while in use, I suspect that the problem happens during storage, but only a guess.