The water appears inside at the top of the windows, but it is not clear to me that the entry point is there. The water could be entering from higher up (roof centerline, for example) and flowing down inside the wall until it encounters the "dam" at the top of the windows. The fact that several windows leak from the top supports this thought. It is unlikely that several windows are defective, or were installed incorrectly.
Try this. Get a big sheet of thin plastic, like a cheap painter's drop cloth. Cut a piece a few inches bigger than one of the leaking windows. Put it over the window, and tape all four edges securely and continuously to the side of the trailer. Masking tape is fine. In the next rainstorm, does that window leak?
Bill
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