I'd hazard a guess that you are not hooked to shore power and when the slides are opened the draw on the battery causes it to drop below the minimum charge required by the detector causing it to trip. If this is the case I would expect that by leaving the trailer sitting for a few more days without charging the battery and you'll find the alarm trips on its own without the action of the slide just from the continued drain of the flashlight, detector and anything else that may be drawing from the battery.
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