First, buy a humidity gage. They cost little: $10 or so. Knowing specifics is helpful to you and to any knowledgeable person you talk to.
Second, get a dehumidifier. It works minor miracles in both summer and winter. Ever notice how, on cooler but humid mornings, the bedding is damp and you feel 'sweaty?' It's because the A/C doesn't run much and humidity is high. Mid-day, usually the humidity is OK because of the A/C. But you don't know what humidity levels are during the day or morning, right? That's why you need a gage.
So do both of the above, and keep the humidity in the 50% or below range. All will be well, bedding won't be sticky, and you AND your RV will be healthier. All this, for probably about $200: well worth it.
Incidentally, by removing the humidity with the dehumidifier, this lets the A/C work more directly at cooling rather than dehumidification. The act of using a dehumidifier will, roughly, increase the cooling capacity of the A/C by . . . oh, let's say, 25% depending upon numerous variables.