One of the things I've found with Air Conditioners (Both home and professional) is that they have some way to drain the condensate, Professional and Centeral home units are designed to drain to the sewer system, Window air conditioners are designed to drain to a pan outside the house under the condensor, this allows the heat of the condensor coil to evaporate much of the water, it also improves the efficency of the unit.
Alas, Sometimes there is more condensate than the outside coil can evaporate, then it drips outside the house
RV roof units are simular to the window units I'm familure with save they drip onto the roof instead of the ground.
Three things can cause them to drip inside
1: If they are not proprely leveled, then the inside pan can run over. Level the rig
2: If "Crud" has clogged to path the water takes as it drains to the outside (happens on Commericial and Centeral too) Cleaning is all that's needed
3: And you should hope this is not it,,, As the song goes "There's a hole in the bottom of the well"
Or in this case, the drain pan
The good news is,,, The only time I've ever seen a hole in the bottom of the drain pan was because I had put one there, on purpose, using a drill (Long story but I obtained the desired result with said drill)