You can make a temporary bandage patch with
fiberglass cloth and resin. That will seal up the hole for your journey. Then when you have the time you can remove that make-do repair with cutting and grinding flush and make a properly shaped and faired in invisible repair. Keeping the weather out is the main thing. So what if it looks ugly for a few weeks, just do it and fix it right later.
Tip to help you do it without a big mess. Trim the cloth to size so there is some overlap. Tape a plastic sheet or cut open garbage bag onto a flat, protected, work table surface making that plastic a little larger than your patch. Put a few pieces of masking tape at the corners of the plastic to hold it down. Lay the cloth down on that plastic. Now mix the resin up and push it into the cloth with a disposable
paint brush or squeege. You want just enough resin that the cloth turns from white to clear. But you don't want so much resin it will make a drippy mess. Take the tape off the plastic, now with a helper pick up the plastic sheet with the cloth on it and take it over to the trailer and press it in place peeling the plastic off before the resin sets up hard. The professionals do this job with "peel ply" which stays in place until the resin hardens then they remove the peel ply, it is a great method which leaves a smooth surface on the resin. But you are just doing a temporary repair so plastic is budget friendly and easy to come by. The reason for the plastic or peel ply is it makes spreading the resin easier and it makes transferring the material easier and also you don't stretch the patch out of shape. Once the patch has hardened you can brush another coat of resin on it to seal any small voids.
Anyway a temporary patch will get you to where you are going and make do for a while until you can get it properly repaired. It is something a person with little to no experience can manage.