It can be lots of things. I would suggest that you take a step back and immediately assess the trailer from top to bottom. If it has a leak there may be others or others about to happen. Look at the sealant on every roof seam (length and width), every entry through the roof (A/C, vents etc.) and everything around the windows, transition strips etc. Those things have screws under them and if water gets into those channels the next stop is your walls via the screws. The rubber/vinyl covers over those strips is probably worn out, cracked or missing if they haven't been replaced...which they should be.
Look everything over carefully. The sealant should be somewhat fresh looking with no cracks, pinholes or voids. Sealant along the transition strips and anywhere else that was sealed should be continuous and in good shape. Look it over and get back. There are specific products for specific applications so don't just start putting silicone on everything.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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