Bottom right ?? If you're inside the trailer, looking aft? or outside the trailer, standing behind it, looking forward ??? Do you mean the curb side or the road side of the trailer?
Why does that make a difference? On many trailers, the electrical entry is on the aft roadside corner and on several floorplans, the city water/fresh water tank fill are also around that area.
Usually, it's much easier to access the "wood part of a Cougar" from the inside than from the outside. The wall framing is aluminum, the outer wall is fiberglass. Neither of those is a "common failure for water damage".
If you go inside, move the two chairs into the center of the room, you can get on your hands and knees and carefully inspect the flooring/lower part of the wall space for any signs of water intrusion. If there is any, it's easier to use a box cutter or razor knife to cut the carper along the rear wall and about a foor or so on each side wall and pull it away from the floor so you can inspect under it.
If you see damage or evidence of water intrusion, the first action should be to repair the leak !!! After that, and you're SURE that you have no further leaking, devise a procedure to remove and replace the damaged material.
All that said, in a 10 year old trailer, condensation along the rear wall from a single pane rear window that covers nearly the entire rear wall, is going to cause some staining of the interior wall and the sun coming through that window will cause some significant "sun fade", so be aware of what you're looking at as you search for water damage vs "normal deterioration" .....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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