hOmeLabs Small Space Dehumidifier with Auto Shut-Off - Quietly Extracts Moisture to Reduce Odor and Allergies from Mold and Mildew - Compact and Portable, Ideal for Bedrooms, Bathrooms and Closets
https://www.amazon.com/dp/B072C3NMK1..._5r9MDbQ8X1YZP
This is the one I use. It works really well. Your camper is probably bigger than mine but I don’t see it being an issue but if so maybe run two of them. I don’t typically have to empty it until I’m ready to pack up and go home from a two day trip.