FX4ME614

Hi everyone I have 20 inch Fuel rims which came from the dealer already installed when I bought the truck..(XLT SCREW). wondering if keeping them on during our lovely winter here in Ontario will do any damage to them? Mostly concerned about salt..I was also thinking of just sucking it up and getting 18 inch rims and winter tires but really don't feel like spending $1300..thanks.