I store my motorcycle in a well maintained epoxy-finished cement floored garage that is just a little over a year old. We have two cars that are in and out through a long snowy season. Would a bag or tub of desiccant under the cover help ? Any other advice?
I have a bike lift I got from Harbor freight. I roll it under the bike and jack it up off the floor, then I roll the lifted bike against the wall. It keeps the tires off the floor and the bike out of the way. I'm not sure if desiccant would work..I do know not to eat it....

I would recommend a dehumidifier if you're concerned about moisture. What I've found over the years is my bikes will kinda "fog up" at times. It used to drive me crazy but not so much anymore
Have you ever seen those Harley Bubbles? Gitcha one!
Food for thought