Has anyone any experience with slideout covers for Whitehawks. I have a 2017 dsrl on order. I inquired through my salesman about adding a slideout cover for the one slideout. A day later he advised me that the Jayco factory rep told him it couldn't be done as their is no solid backing to attach it to. Thus, I'll take delivery without it. I know that there are after market slideouts, but not sure its feasible based upon the above info. Anyone had any experience or knowledge about adding slideout covers on Whitehawks?