Bill, as you may know Fort Wilderness rates vary wildly ($41-$96/night)depending on hookups and time of the year. 11/25-12/19 is their "Value" season, which is their cheapest rates. Sounds like that is the time zone your are aiming at?
Here is the rate page, if you don't already have it.
Fort Wilderness Rates
Also, you are probably also aware that they do not have weekly or monthly rates - just daily. Keeps people moving through, I guess.