1. Forget the damp-rid. Unless it is changed every week or so, it is useless.
2. Forget the A/C. There is no need to leave the unit operating that long without someone checking it and cleaning/changing filters frequently.
3. Forget the dehumidifier. Again, unless someone is checking on it, then there is too much potential for a clogged drain to flood the RV, or a frozen appliance to overheat and cause a fire.
4. The key to successfully leaving the RV unattended during the summer months is ventilation. Slightly open enough windows to get cross ventilation. The more air you can naturally exchange through the RV the better you are. Hot air rises and affording an exit toward the ceiling for the hot, stale air, and offering an entrance closer to the floor for cooler, fresh air will provide the exchange of air and will be all you need to do.
