With any luck, you don't have to remove the airco from the roof.
If you take the cap/shroud off the air conditioner (3 big Phillips screws facing the sky, as I recall), you will be able to see the condensate drain pan. The pan has an outlet pipe, and the pipe is probably clogged with leaves and junk. As I recall, the pipe drains directly onto the roof, away from any opening or seam, and the water is supposed to drain off the roof and down the side of the trailer. Once you have found the drain pan and its drain hole, you may want to attach a piece of clear vinyl hose to the end of the pipe, and direct the water a bit further to the side and down the roof slope.
In the air conditioner manual, find the picture of the parts arrangement and placement under the shroud.
When you get up on the roof to remove the shroud, be sure you put down a thin piece of plywood or the like, a couple feet square, to distribute your weight. Otherwise you could bend the roof a bit, resulting in dishing which might catch water and direct it where you don't want it - like inside.
Bill
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