Originally Posted by AIRTRVL
Keep in mind that step covers hold in moisture causing your step to rust faster than they would if left uncovered.
Good point, also if you get into cold weather, moisture in the mats can freeze creating a little slip-n-slide! I'd prefer to have a door mat with really good "crud scraping" ability and bare steps. Something more like a 2 inch deep astroturf that will drain moisture through.
PS - ever notice how more and more RV parks are requiring patio rugs that let sun and moisture to go through them so that the next camper doesn't get a muddy puddle? An overdue requirement IMHO.