Keeping moisture out?

So I have a fairly new (21) Trailer, and when I opened it up a few weeks ago, I noticed I have rust starting on wheel studs on my kart what does every one do to keep moisture down during storage season? I don't want to ruin my hard earned equipment. Thanks
 
I like to spray my kart with WD40 after washing it or when putting up at the end of the season. I get the gallon size container of the stuff and use a spray bottle with adjustable nozzle to apply it. Less is more, a light coat on the chassis and anything metal is all you need.
 
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