Church needs to store 60" mower outdoors this summer. It will be in a area that will have concrete under it but want to know what others may use besides those blue tarps from box stores..They seem to blow around alot. This may even need stored in winter out there. Is their a heavy covering that works well? Do they have a convas type universal cover just for these? ( it is a 60" GD walk behind w/sit-on sulky)- Thanks!