We need more information--is this the original AC that is held in place with a million screws/rivets, or a more modern unit that is clamped in place by only 3 or 4 bolts? If the former, then your unit has probably rusted through and is allowing water to pour into your trailer. If the latter, then it could be the foam rubber gaskets that seal the unit to the roof, or a crack in the plastic condensate drip pan (if so equipped). Easiest thing to do in any case is to remove the ceiling assembly and look up in there to see where the water is coming from.
good luck
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