Snow socks -- plastic sleeves for tires? Really?

My son drives professionally and told me to get a set of these for the motorhome. He says that they will get me to the next exit and to a safe place to park if I encounter icy conditions. They are much easier to put on and much lighter than chains. He carries a set just to get him to a place where he can safely chain up if a sudden weather change leaves him on the road in precarious conditions. They will not last long on dry pavement and are not really intended for long distance driving in snow/ice.