Prob with covers they do tend to wear through the paintwork with movement esp in windy days,if you are going to use one make sure its well padded at corners or edges,i have boats and this has been a big problem.
Better if you could find a sheltered building to keep it out of weather,but do remove all cushens /bedding and leave all cupboards open,and small vent ,remember to set mouse traps inside and engine bay,they do love wireing to chew.