Robert:
Thanks for coming back to the Mom's Panel!
You can make your loop request as soon as you make your reservation at
Fort Wilderness. Because you've already made your reservation, simply call back and add your request. Keep in mind that Disney doesn't guarantee requests but tries every effort to accommodate campers, so to better your chances of getting a site with the attributes you want, tell Disney WHY you are requesting that specific loop or site: do you want to be near the canal? do you want to be away from the bus stop, and, therefore, less noise? do you want to be near the Comfort Station? do you want a woods view?
If you have any more questions, Robert, please feel free to come back and ask!
Wishing y'all a magical vacation!
Whitney