If it was me, I would check websites like "outdoorsy.com" and similar are like AirBnbs / VRBO for RVs (a quite search on their website shows 906 listings in "Four Corners, FL" but that's with no dates).
I've never actually used them but I suspect you can save significantly and likely get better / larger TTs if that's what you are looking for.
If you are looking for something already setup, just specify that you are looking for a price including drop-off, setup and removal from Fort Wilderness.
One thing I would suggest is look at their insurance options. I think it's designed for people that are renting and towing the TTs or driving the RVs but if you aren't doing that, you might not need full insurance coverage.
Hope this helps,
Mike