Thanks so much for the suggestions, and the questions. We had a fully customized vinyl skirting on our old 5th wheel, and it certainly looked nice. I don't think it provided much in the way of insulation value, however, and they are very expensive. Here in Canada, I've been quoted as much as $4k. We have the trailer in a permanent spot, although it's possible that we might move it in the future, so it's something we would like to move with us. I sort of like the look of the Insul-skirt, foam board system, although it's not avail in Canada. Ideally we would want something that is attractive & functional. I'm also not discounting the idea that we might just go with framed and insulated plywood sections that could be torn down. Anyone done this? pictures?