Danny, our camping kitty, crosed the Rainbow Bridge in February. I really like the idea of having my cats with us, they are our family. My other two cats are 14 year old brother and sister and they went camping with us when they were younger, but we went seven years RV-less and once we started back up we only took our younger one as he was the most laid back. We pick up our 39'FW in two weeks and plan to gradually introduce them to it while it is parked at home. Has anyone here used the Comfort Zone plug-ins in their RV and do you think they work?