Rumline, yes, we are getting the latex mattress. I had not thought of using duct tape, nor sewing additional cloth to the edges as Trueaco has done. (We are great users of duct tape and needle and thread.) And, yes, as MontanaOliver has done, we purchased a cover to enclose the mattresses.
Maybe we are worrying for naught. Perhaps with the mattress covers and a new dehumidifier, we should just relax and enjoy our new adventures.