There are no drain lines for the ac unit on the roof of the rv.
Rv roof ac drain off roof.
The moisture that is removed from inside the rv must be relocated to the roof of the rv where it usually evaporates.
On very hot and humid days well over 35 of the energy used by the roof air conditioner is for moisture removal alone.
I would suggest taking off the exterior shroud and metal evaporator shield and cleaning the drip pan and checking the drain holes.
The condensation drips down into a pan which has an outlet on the side of the base pan that lets the water run onto the roof.
Typically a few screws or nuts hold it in place.
At roof top level remove the shroud covering your a c unit.
Turn off the air conditioner unit.
If it is leaking inside you most likely have a clogged outlet which can be easily opened with a stiff wire probed in the drain outlet.
One of the most common causes of the water leaking from air conditioner in rv is drain pan not able to drain the water properly.
The reason for this gap is that on most roof top a c units the condensation drains out the bottom of the unit between the base of the air conditioner and the roof.
The fix is easy.
On those types of days quite a bit of water may collect in the pan of the air conditioner.
Which ideally should drain the water from the evaporator coil on the roof instead of inside of the rv.