This is question for those of you in the North. With winters, salt etc on the roads. I am looking to get a bed topper for my new truck. Don't really want a full topper. How do the roll'n lock type bed toppers work? In the winter with snow, salt etc? Do they jam up. I really like the idea of their security and they roll up by them selves so easy to open close. Not looking for a vinyl type that snaps or has velcro. Just wondering from experience if the roll up hard covers are good for the midwest. I am in Wisconsin, we use salt on the roads.

Thanks.