X3 Grumpy suggestion. We use these in the house and they work well to keep out the drafts. I can actually see the bow in and out on windy days.
2013 Jayco JayFlight 26RKS
2013 Ford F150 Ecoboost FX4
2003 Coleman Bayside / 2011 Jayco Jayfeather X20E -- RIP
2012 Tacoma Sport DCSB / 2013 Tundra SR5 - RIP