I have used the same Dowco Guardian for years. In fact, my uncle gave it to me when he sold his Gold Wing and it was about three years old then. Great cover. Used when parking my bike under a carport in both Florida and S/E Texas with no problems at all.I use the Dowco Guardian on both bikes. I figure you will need at least the XXL for your HD.
Amazon.com: Dowco Guardian 50005-02 WeatherAll Plus Indoor/Outdoor Waterproof Motorcycle Cover: Black, XX-Large : Everything Else
Around 5 years of being in all weather, the stitching starts to come undone around the elastic cinch strap at the bottom.
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I would put some some of paver down for the bike to sit on. Long periods of resting in the dirt is not good for the rubber.