Here is some information from AllEars but it does not say anything about them setting up the tent. Good luck.
Yes. The official policy for Fort Wilderness is that rental tents and cots are only available to groups of 20 or more using Creekside Meadow, the primitive camping area. However, official policy and practice seem to differ. Individuals have rented equipment before and I've called FW myself and been told they do rent equipment to individuals if they have it available and a group hasn't already made arrangements to rent it. Tents are $30 per night, cots are $4 per night, so it's not cheap. Also, if you do stay in Creekside Meadow, the cost is $10 per person (20 person minimum). For group reservations, call (407) 939-7807 Monday through Friday between 9 a.m. and 4 p.m.