When we trailered our boat from Boise to Reno, I ran 24” plastic wrap from Lowe’s around about 6” below the cover line, and around any contact points. Like Larry said, the over tower cover sucks down so well at low speed, and doesn’t move at high speed. In towing to Modesto for warrantee work, I didn’t plastic wrap beforehand, and not a bit of chafe. I probably cause more chafe putting the cover on and off than from driving with it. Caveat being it was dry on both trips. Add wet road grime and de-icer I would plastic wrap underneath and shrink wrap over the cover. See if any nearby shops have the felt transport covers. I don’t know if SC ships their boats with them, but some others do.