I'd spend a day closing in the carport properly with tin, seal up every opening and make sure animals can't get in. I've been finding acorns in the engine bays of all our cars and the other day I found a dead possum with his head underneath the front wheel of my HD. I can only assume he was scared from the engine bay when I started the motor and he then hid behind the wheel. I'd only moved the car back about a foot the last time i'd started it so that the trailer could fit past.
Found plenty of rats nests in engine bays out at the farm too.