We traveled with two cats for several years and had a screen room add on for them briefly. It was not secure enough to hold them no matter how many modifications we did to it. The best thing you can do is start retraining your cat NOW while you are still in a house. It can be done but it will take a lot of effort on your part. Our cats retrained to waiting by the door for us to put their leashes on before we took them outside. I'm not saying it will be easy but better to do it now while still in a house then later when you may be in a trailer. It took us about 4 months of work to retrain ours.
