Do you keep a dehumidifier in your garage to keep your classic car from turning into a pile of rust?

I am in the desert but about a mile from the Sea of Cortez and in the mornings there is a very heavy dew. After sunrise, things dry up quickly.

I was shocked to find a layer of rust on the front pulley disc of a new water pump I had purchased (and it was stored indoors). Just have to live with it here and make sure everything is painted or oil-protected.

I don't know how a metal garden gate is looking rusty again, the landlord re-painted it not too long ago and it is was looking like new.