Is the spot soft or damp? The reason I ask, my old trailer had a spot like that above the door. It worried me to death until I took it apart. Come to find out, there wasn’t a leak at all. The paneling wasn’t cut to the right size and was just bubbled up.
As far as seeking out any active leaks, I think I would remove the bottom panel on the inside first, just below the transition strip. You can get a good look to see what type of damage really exists. You may have to remove/replace old insulation too. While the wall is open you can have someone flow the garden hose over the front of the trailer to locate the leak.
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Aaron
2006 T-2553
2009 GMC Sierra 1500 3.73 6-speed
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