We were in the 1100 loop in March and it backed up to a cabin loop ( I cant recall which one and my map is in my truck ) They were very close and would suit your situation.
The one problem we encountered was folks from the cabin loop cutting through the campsite next to us and occasionally ours, I believe most campers consider that inconsiderate.
I would imagine if you were to call the FW front desk and ask they could tell you how likely it would be to be able to get you close to each other. My personal opinion would be that the 1100, 1200 1nd 1300 would be your best camping loops.
Hope that helps a little
Scott