Next time you get on roof, look on each side of the A/C unit and at the very bottom there is a drain, take a stiff piece of wire and stick it the hole, some stuff may be blocking the hole, once you clean out the hole you should not have any more problems. I have to do that to our A/C about every 2 months to keep the water draining on the roof not in the trailer. The drains are along the side of the A/C.
2011 jayco 33rlds, 2002 Ford excursion, v-10, 3:73 gears 4x4 mine. 2008 Suzuki sx-4, hers. Retired Air Force, now Retired.