RV and Van campers understand the same struggles as Car Campers regarding moisture and condensation on the inside windows after a night of sleep.
The EVA Dry Renewable Mini Dehumidifier and DAMPRID Hanging Moisture Absorber have been my best friends throughout this Prius Camping adventure.
By setting the Eva-Dry on the dash at night, I no longer have moisture build up on the front windshield the following morning. Since the DAMPRID has to hang, I have mine hanging on a magnetic hook above my refrigerator.
I choose to go metal for my rear seat platform after reading stories of people growing mold on wood in their vehicles by not properly venting and controlling moisture in their vehicles.