No, any type rig can be on any site and I have seen tents in every loop except the cabin loops. There are 3 levels of campsites at Fort Wilderness:
Standard, which includes electric and water (most tents tend to stay here but it is not required. This includes the 1500 and 2000 loops
Full Hook Up, which includes electric, water and sewer (most of them are this way) This includes the 600, 800, 900, 1000, 1100, 1200, 1300, 1600, 1700, 1800, and 1900 loops.
Preferred, which includes electric, water, sewer and cable TV The preferred sites are also in loops situated closer to the settlement which includes the marina, beach, restaurant, petting zoo and many other activities. Also, if you plan on using the cable TV hook up, remember to bring a long coaxial cable to hook up with. If you don't have one Disney will be happy to sell you one.FW Camp Site This includes the 100, 200, 300, 400, 500, 700 and 1400 loops.
The preferred and full hook up sites provide a full length concrete parking pad for the tow vehicle and camper. Behind that is a compacted sand/gravel pad on which you will find a full sized picnic table. On the standard sites you will find a smaller concrete pad and larger sand/gravel pad which gives you a little more room to set up a tent.