Need more input: Year, Model, Ducted air system, Is it a low profile type unit, is it a 1300btu Unit, is your rear AC on also, Do you have dump vents on the unit, Last servicing on the AC unit, and is your RV level?
I am leaning to the condenser's drip pan drains may not be clear. This is accessed outside inside the unit and the cover will need to be removed, screws taken out of the ACs doghouse and the condenser and drip pan cleaned.