While I have not done this myself, I have seen people on this board report many times over the year that, based on parking availability (and I would bet that availability is pretty high right now), they will allow you to park your trailer/RV in the lot of the resort you are staying at.. they will direct you to where in the lot they want you to park. I have not read a post saying that someone was unable to do so after making the attempt. Overflow lot at FW, from what I have read over the years, only good for parking trailer if you going to do stuff elsewhere on day of checking in before site ready, or to drop off for day after check out if you still planning to spend day at Disney. I do not believe you are allowed to leave it in FW overflow while staying g elsewhere on property, but, like I said, I have not seen anyone report difficulty parking them in lot of resorts at which they are staying. I imagine you could call specific resort to check/confirm this. It is not unusual to see RV’s/trailers parked in resort lots in my experience.