Ok, Here is what most folks do not know about MAX-AIR
THe only difference between MAX and NORMAL is where the air comes from going into the evaporator unit.. MAX recirculates air from INSIDE the Vehicle,, on RV's it's usually a grill near the passanger's foot (How the water is getting in)
On "Regular" it's a mix of recirculated and fresh (outside) air.
Under high humidity it may be the drain tube is not draining fast enough, or it may be partially clogged.. Or there may be a design / install fault. If the RV Is udner warranty go to authorized service place or warranty factory.
If not. If you can easily open the condenser compartment (Some you can, some you can't) Inspect.