storing you 5th wheel in AZ

We have been putting two 5 gallon buckets of water inside the rig during the heat in order to maintain some humidity to keep the wood cabinets, etc from drying out. We were told to do this by a life-long AZ resident.

We have the rig in a RV storage place. We go buy frequently to check on it - watching for the possibility of critters and to re-fill the water buckets.